if (!HTMLElement.prototype.createShadowRoot
    || window.__forceShadowDomPolyfill) {

/*
 * Copyright 2013 The Polymer Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
(function() {
  // TODO(jmesserly): fix dart:html to use unprefixed name
  if (Element.prototype.webkitCreateShadowRoot) {
    Element.prototype.webkitCreateShadowRoot = function() {
      return window.ShadowDOMPolyfill.wrapIfNeeded(this).createShadowRoot();
    };
  }
})();

// Copyright 2012 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

(function(global) {
  'use strict';

  var PROP_ADD_TYPE = 'add';
  var PROP_UPDATE_TYPE = 'update';
  var PROP_RECONFIGURE_TYPE = 'reconfigure';
  var PROP_DELETE_TYPE = 'delete';
  var ARRAY_SPLICE_TYPE = 'splice';

  // Detect and do basic sanity checking on Object/Array.observe.
  function detectObjectObserve() {
    if (typeof Object.observe !== 'function' ||
        typeof Array.observe !== 'function') {
      return false;
    }

    var records = [];

    function callback(recs) {
      records = recs;
    }

    var test = {};
    Object.observe(test, callback);
    test.id = 1;
    test.id = 2;
    delete test.id;
    Object.deliverChangeRecords(callback);
    if (records.length !== 3)
      return false;

    // TODO(rafaelw): Remove this when new change record type names make it to
    // chrome release.
    if (records[0].type == 'new' &&
        records[1].type == 'updated' &&
        records[2].type == 'deleted') {
      PROP_ADD_TYPE = 'new';
      PROP_UPDATE_TYPE = 'updated';
      PROP_RECONFIGURE_TYPE = 'reconfigured';
      PROP_DELETE_TYPE = 'deleted';
    } else if (records[0].type != 'add' ||
               records[1].type != 'update' ||
               records[2].type != 'delete') {
      console.error('Unexpected change record names for Object.observe. ' +
                    'Using dirty-checking instead');
      return false;
    }
    Object.unobserve(test, callback);

    test = [0];
    Array.observe(test, callback);
    test[1] = 1;
    test.length = 0;
    Object.deliverChangeRecords(callback);
    if (records.length != 2)
      return false;
    if (records[0].type != ARRAY_SPLICE_TYPE ||
        records[1].type != ARRAY_SPLICE_TYPE) {
      return false;
    }
    Array.unobserve(test, callback);

    return true;
  }

  var hasObserve = detectObjectObserve();

  function detectEval() {
    // don't test for eval if document has CSP securityPolicy object and we can see that
    // eval is not supported. This avoids an error message in console even when the exception
    // is caught
    if (global.document &&
        'securityPolicy' in global.document &&
        !global.document.securityPolicy.allowsEval) {
      return false;
    }

    try {
      var f = new Function('', 'return true;');
      return f();
    } catch (ex) {
      return false;
    }
  }

  var hasEval = detectEval();

  function isIndex(s) {
    return +s === s >>> 0;
  }

  function toNumber(s) {
    return +s;
  }

  function isObject(obj) {
    return obj === Object(obj);
  }

  var numberIsNaN = global.Number.isNaN || function isNaN(value) {
    return typeof value === 'number' && global.isNaN(value);
  }

  function areSameValue(left, right) {
    if (left === right)
      return left !== 0 || 1 / left === 1 / right;
    if (numberIsNaN(left) && numberIsNaN(right))
      return true;

    return left !== left && right !== right;
  }

  var createObject = ('__proto__' in {}) ?
    function(obj) { return obj; } :
    function(obj) {
      var proto = obj.__proto__;
      if (!proto)
        return obj;
      var newObject = Object.create(proto);
      Object.getOwnPropertyNames(obj).forEach(function(name) {
        Object.defineProperty(newObject, name,
                             Object.getOwnPropertyDescriptor(obj, name));
      });
      return newObject;
    };

  var identStart = '[\$_a-zA-Z]';
  var identPart = '[\$_a-zA-Z0-9]';
  var ident = identStart + '+' + identPart + '*';
  var elementIndex = '(?:[0-9]|[1-9]+[0-9]+)';
  var identOrElementIndex = '(?:' + ident + '|' + elementIndex + ')';
  var path = '(?:' + identOrElementIndex + ')(?:\\s*\\.\\s*' + identOrElementIndex + ')*';
  var pathRegExp = new RegExp('^' + path + '$');

  function isPathValid(s) {
    if (typeof s != 'string')
      return false;
    s = s.trim();

    if (s == '')
      return true;

    if (s[0] == '.')
      return false;

    return pathRegExp.test(s);
  }

  var constructorIsPrivate = {};

  function Path(s, privateToken) {
    if (privateToken !== constructorIsPrivate)
      throw Error('Use Path.get to retrieve path objects');

    if (s.trim() == '')
      return this;

    if (isIndex(s)) {
      this.push(s);
      return this;
    }

    s.split(/\s*\.\s*/).filter(function(part) {
      return part;
    }).forEach(function(part) {
      this.push(part);
    }, this);

    if (hasEval && !hasObserve && this.length) {
      this.getValueFrom = this.compiledGetValueFromFn();
    }
  }

  // TODO(rafaelw): Make simple LRU cache
  var pathCache = {};

  function getPath(pathString) {
    if (pathString instanceof Path)
      return pathString;

    if (pathString == null)
      pathString = '';

    if (typeof pathString !== 'string')
      pathString = String(pathString);

    var path = pathCache[pathString];
    if (path)
      return path;
    if (!isPathValid(pathString))
      return invalidPath;
    var path = new Path(pathString, constructorIsPrivate);
    pathCache[pathString] = path;
    return path;
  }

  Path.get = getPath;

  Path.prototype = createObject({
    __proto__: [],
    valid: true,

    toString: function() {
      return this.join('.');
    },

    getValueFrom: function(obj, observedSet) {
      for (var i = 0; i < this.length; i++) {
        if (obj == null)
          return;
        if (observedSet)
          observedSet.observe(obj);
        obj = obj[this[i]];
      }
      return obj;
    },

    compiledGetValueFromFn: function() {
      var accessors = this.map(function(ident) {
        return isIndex(ident) ? '["' + ident + '"]' : '.' + ident;
      });

      var str = '';
      var pathString = 'obj';
      str += 'if (obj != null';
      var i = 0;
      for (; i < (this.length - 1); i++) {
        var ident = this[i];
        pathString += accessors[i];
        str += ' &&\n     ' + pathString + ' != null';
      }
      str += ')\n';

      pathString += accessors[i];

      str += '  return ' + pathString + ';\nelse\n  return undefined;';
      return new Function('obj', str);
    },

    setValueFrom: function(obj, value) {
      if (!this.length)
        return false;

      for (var i = 0; i < this.length - 1; i++) {
        if (!isObject(obj))
          return false;
        obj = obj[this[i]];
      }

      if (!isObject(obj))
        return false;

      obj[this[i]] = value;
      return true;
    }
  });

  var invalidPath = new Path('', constructorIsPrivate);
  invalidPath.valid = false;
  invalidPath.getValueFrom = invalidPath.setValueFrom = function() {};

  var MAX_DIRTY_CHECK_CYCLES = 1000;

  function dirtyCheck(observer) {
    var cycles = 0;
    while (cycles < MAX_DIRTY_CHECK_CYCLES && observer.check()) {
      observer.report();
      cycles++;
    }
    if (global.testingExposeCycleCount)
      global.dirtyCheckCycleCount = cycles;
  }

  function objectIsEmpty(object) {
    for (var prop in object)
      return false;
    return true;
  }

  function diffIsEmpty(diff) {
    return objectIsEmpty(diff.added) &&
           objectIsEmpty(diff.removed) &&
           objectIsEmpty(diff.changed);
  }

  function diffObjectFromOldObject(object, oldObject) {
    var added = {};
    var removed = {};
    var changed = {};
    var oldObjectHas = {};

    for (var prop in oldObject) {
      var newValue = object[prop];

      if (newValue !== undefined && newValue === oldObject[prop])
        continue;

      if (!(prop in object)) {
        removed[prop] = undefined;
        continue;
      }

      if (newValue !== oldObject[prop])
        changed[prop] = newValue;
    }

    for (var prop in object) {
      if (prop in oldObject)
        continue;

      added[prop] = object[prop];
    }

    if (Array.isArray(object) && object.length !== oldObject.length)
      changed.length = object.length;

    return {
      added: added,
      removed: removed,
      changed: changed
    };
  }

  function copyObject(object, opt_copy) {
    var copy = opt_copy || (Array.isArray(object) ? [] : {});
    for (var prop in object) {
      copy[prop] = object[prop];
    };
    if (Array.isArray(object))
      copy.length = object.length;
    return copy;
  }

  function Observer(object, callback, target, token) {
    this.closed = false;
    this.object = object;
    this.callback = callback;
    // TODO(rafaelw): Hold this.target weakly when WeakRef is available.
    this.target = target;
    this.token = token;
    this.reporting = true;
    if (hasObserve) {
      var self = this;
      this.boundInternalCallback = function(records) {
        self.internalCallback(records);
      };
    }

    addToAll(this);
  }

  Observer.prototype = {
    internalCallback: function(records) {
      if (this.closed)
        return;
      if (this.reporting && this.check(records)) {
        this.report();
        if (this.testingResults)
          this.testingResults.anyChanged = true;
      }
    },

    close: function() {
      if (this.closed)
        return;
      if (this.object && typeof this.object.close === 'function')
        this.object.close();

      this.disconnect();
      this.object = undefined;
      this.closed = true;
    },

    deliver: function(testingResults) {
      if (this.closed)
        return;
      if (hasObserve) {
        this.testingResults = testingResults;
        Object.deliverChangeRecords(this.boundInternalCallback);
        this.testingResults = undefined;
      } else {
        dirtyCheck(this);
      }
    },

    report: function() {
      if (!this.reporting)
        return;

      this.sync(false);
      if (this.callback) {
        this.reportArgs.push(this.token);
        this.invokeCallback(this.reportArgs);
      }
      this.reportArgs = undefined;
    },

    invokeCallback: function(args) {
      try {
        this.callback.apply(this.target, args);
      } catch (ex) {
        Observer._errorThrownDuringCallback = true;
        console.error('Exception caught during observer callback: ' + (ex.stack || ex));
      }
    },

    reset: function() {
      if (this.closed)
        return;

      if (hasObserve) {
        this.reporting = false;
        Object.deliverChangeRecords(this.boundInternalCallback);
        this.reporting = true;
      }

      this.sync(true);
    }
  }

  var collectObservers = !hasObserve || global.forceCollectObservers;
  var allObservers;
  Observer._allObserversCount = 0;

  if (collectObservers) {
    allObservers = [];
  }

  function addToAll(observer) {
    if (!collectObservers)
      return;

    allObservers.push(observer);
    Observer._allObserversCount++;
  }

  var runningMicrotaskCheckpoint = false;

  var hasDebugForceFullDelivery = typeof Object.deliverAllChangeRecords == 'function';

  global.Platform = global.Platform || {};

  global.Platform.performMicrotaskCheckpoint = function() {
    if (runningMicrotaskCheckpoint)
      return;

    if (hasDebugForceFullDelivery) {
      Object.deliverAllChangeRecords();
      return;
    }

    if (!collectObservers)
      return;

    runningMicrotaskCheckpoint = true;

    var cycles = 0;
    var results = {};

    do {
      cycles++;
      var toCheck = allObservers;
      allObservers = [];
      results.anyChanged = false;

      for (var i = 0; i < toCheck.length; i++) {
        var observer = toCheck[i];
        if (observer.closed)
          continue;

        if (hasObserve) {
          observer.deliver(results);
        } else if (observer.check()) {
          results.anyChanged = true;
          observer.report();
        }

        allObservers.push(observer);
      }
    } while (cycles < MAX_DIRTY_CHECK_CYCLES && results.anyChanged);

    if (global.testingExposeCycleCount)
      global.dirtyCheckCycleCount = cycles;

    Observer._allObserversCount = allObservers.length;
    runningMicrotaskCheckpoint = false;
  };

  if (collectObservers) {
    global.Platform.clearObservers = function() {
      allObservers = [];
    };
  }

  function ObjectObserver(object, callback, target, token) {
    Observer.call(this, object, callback, target, token);
    this.connect();
    this.sync(true);
  }

  ObjectObserver.prototype = createObject({
    __proto__: Observer.prototype,

    connect: function() {
      if (hasObserve)
        Object.observe(this.object, this.boundInternalCallback);
    },

    sync: function(hard) {
      if (!hasObserve)
        this.oldObject = copyObject(this.object);
    },

    check: function(changeRecords) {
      var diff;
      var oldValues;
      if (hasObserve) {
        if (!changeRecords)
          return false;

        oldValues = {};
        diff = diffObjectFromChangeRecords(this.object, changeRecords,
                                           oldValues);
      } else {
        oldValues = this.oldObject;
        diff = diffObjectFromOldObject(this.object, this.oldObject);
      }

      if (diffIsEmpty(diff))
        return false;

      this.reportArgs =
          [diff.added || {}, diff.removed || {}, diff.changed || {}];
      this.reportArgs.push(function(property) {
        return oldValues[property];
      });

      return true;
    },

    disconnect: function() {
      if (!hasObserve)
        this.oldObject = undefined;
      else if (this.object)
        Object.unobserve(this.object, this.boundInternalCallback);
    }
  });

  function ArrayObserver(array, callback, target, token) {
    if (!Array.isArray(array))
      throw Error('Provided object is not an Array');
    ObjectObserver.call(this, array, callback, target, token);
  }

  ArrayObserver.prototype = createObject({
    __proto__: ObjectObserver.prototype,

    connect: function() {
      if (hasObserve)
        Array.observe(this.object, this.boundInternalCallback);
    },

    sync: function() {
      if (!hasObserve)
        this.oldObject = this.object.slice();
    },

    check: function(changeRecords) {
      var splices;
      if (hasObserve) {
        if (!changeRecords)
          return false;
        splices = projectArraySplices(this.object, changeRecords);
      } else {
        splices = calcSplices(this.object, 0, this.object.length,
                              this.oldObject, 0, this.oldObject.length);
      }

      if (!splices || !splices.length)
        return false;

      this.reportArgs = [splices];
      return true;
    }
  });

  ArrayObserver.applySplices = function(previous, current, splices) {
    splices.forEach(function(splice) {
      var spliceArgs = [splice.index, splice.removed.length];
      var addIndex = splice.index;
      while (addIndex < splice.index + splice.addedCount) {
        spliceArgs.push(current[addIndex]);
        addIndex++;
      }

      Array.prototype.splice.apply(previous, spliceArgs);
    });
  };

  function ObservedSet(callback) {
    this.arr = [];
    this.callback = callback;
    this.isObserved = true;
  }

  // TODO(rafaelw): Consider surfacing a way to avoid observing prototype
  // ancestors which are expected not to change (e.g. Element, Node...).
  var objProto = Object.getPrototypeOf({});
  var arrayProto = Object.getPrototypeOf([]);
  ObservedSet.prototype = {
    reset: function() {
      this.isObserved = !this.isObserved;
    },

    observe: function(obj) {
      if (!isObject(obj) || obj === objProto || obj === arrayProto)
        return;
      var i = this.arr.indexOf(obj);
      if (i >= 0 && this.arr[i+1] === this.isObserved)
        return;

      if (i < 0) {
        i = this.arr.length;
        this.arr[i] = obj;
        Object.observe(obj, this.callback);
      }

      this.arr[i+1] = this.isObserved;
      this.observe(Object.getPrototypeOf(obj));
    },

    cleanup: function() {
      var i = 0, j = 0;
      var isObserved = this.isObserved;
      while(j < this.arr.length) {
        var obj = this.arr[j];
        if (this.arr[j + 1] == isObserved) {
          if (i < j) {
            this.arr[i] = obj;
            this.arr[i + 1] = isObserved;
          }
          i += 2;
        } else {
          Object.unobserve(obj, this.callback);
        }
        j += 2;
      }

      this.arr.length = i;
    }
  };

  function PathObserver(object, path, callback, target, token, valueFn,
                        setValueFn) {
    var path = path instanceof Path ? path : getPath(path);
    if (!path || !path.length || !isObject(object)) {
      this.value_ = path ? path.getValueFrom(object) : undefined;
      this.value = valueFn ? valueFn(this.value_) : this.value_;
      this.closed = true;
      return;
    }

    Observer.call(this, object, callback, target, token);
    this.valueFn = valueFn;
    this.setValueFn = setValueFn;
    this.path = path;

    this.connect();
    this.sync(true);
  }

  PathObserver.prototype = createObject({
    __proto__: Observer.prototype,

    connect: function() {
      if (hasObserve)
        this.observedSet = new ObservedSet(this.boundInternalCallback);
    },

    disconnect: function() {
      this.value = undefined;
      this.value_ = undefined;
      if (this.observedSet) {
        this.observedSet.reset();
        this.observedSet.cleanup();
        this.observedSet = undefined;
      }
    },

    check: function() {
      // Note: Extracting this to a member function for use here and below
      // regresses dirty-checking path perf by about 25% =-(.
      if (this.observedSet)
        this.observedSet.reset();

      this.value_ = this.path.getValueFrom(this.object, this.observedSet);

      if (this.observedSet)
        this.observedSet.cleanup();

      if (areSameValue(this.value_, this.oldValue_))
        return false;

      this.value = this.valueFn ? this.valueFn(this.value_) : this.value_;
      this.reportArgs = [this.value, this.oldValue];
      return true;
    },

    sync: function(hard) {
      if (hard) {
        if (this.observedSet)
          this.observedSet.reset();

        this.value_ = this.path.getValueFrom(this.object, this.observedSet);
        this.value = this.valueFn ? this.valueFn(this.value_) : this.value_;

        if (this.observedSet)
          this.observedSet.cleanup();
      }

      this.oldValue_ = this.value_;
      this.oldValue = this.value;
    },

    setValue: function(newValue) {
      if (!this.path)
        return;
      if (typeof this.setValueFn === 'function')
        newValue = this.setValueFn(newValue);
      this.path.setValueFrom(this.object, newValue);
    }
  });

  function CompoundPathObserver(callback, target, token, valueFn) {
    Observer.call(this, undefined, callback, target, token);
    this.valueFn = valueFn;

    this.observed = [];
    this.values = [];
    this.value = undefined;
    this.oldValue = undefined;
    this.oldValues = undefined;
    this.changeFlags = undefined;
    this.started = false;
  }

  CompoundPathObserver.prototype = createObject({
    __proto__: PathObserver.prototype,

    // TODO(rafaelw): Consider special-casing when |object| is a PathObserver
    // and path 'value' to avoid explicit observation.
    addPath: function(object, path) {
      if (this.started)
        throw Error('Cannot add more paths once started.');

      var path = path instanceof Path ? path : getPath(path);
      var value = path ? path.getValueFrom(object) : undefined;

      this.observed.push(object, path);
      this.values.push(value);
    },

    start: function() {
      this.started = true;
      this.connect();
      this.sync(true);
    },

    getValues: function() {
      if (this.observedSet)
        this.observedSet.reset();

      var anyChanged = false;
      for (var i = 0; i < this.observed.length; i = i+2) {
        var path = this.observed[i+1];
        if (!path)
          continue;
        var object = this.observed[i];
        var value = path.getValueFrom(object, this.observedSet);
        var oldValue = this.values[i/2];
        if (!areSameValue(value, oldValue)) {
          if (!anyChanged && !this.valueFn) {
            this.oldValues = this.oldValues || [];
            this.changeFlags = this.changeFlags || [];
            for (var j = 0; j < this.values.length; j++) {
              this.oldValues[j] = this.values[j];
              this.changeFlags[j] = false;
            }
          }

          if (!this.valueFn)
            this.changeFlags[i/2] = true;

          this.values[i/2] = value;
          anyChanged = true;
        }
      }

      if (this.observedSet)
        this.observedSet.cleanup();

      return anyChanged;
    },

    check: function() {
      if (!this.getValues())
        return;

      if (this.valueFn) {
        this.value = this.valueFn(this.values);

        if (areSameValue(this.value, this.oldValue))
          return false;

        this.reportArgs = [this.value, this.oldValue];
      } else {
        this.reportArgs = [this.values, this.oldValues, this.changeFlags,
                           this.observed];
      }

      return true;
    },

    sync: function(hard) {
      if (hard) {
        this.getValues();
        if (this.valueFn)
          this.value = this.valueFn(this.values);
      }

      if (this.valueFn)
        this.oldValue = this.value;
    },

    close: function() {
      if (this.observed) {
        for (var i = 0; i < this.observed.length; i = i + 2) {
          var object = this.observed[i];
          if (object && typeof object.close === 'function')
            object.close();
        }
        this.observed = undefined;
        this.values = undefined;
      }

      Observer.prototype.close.call(this);
    }
  });

  var expectedRecordTypes = {};
  expectedRecordTypes[PROP_ADD_TYPE] = true;
  expectedRecordTypes[PROP_UPDATE_TYPE] = true;
  expectedRecordTypes[PROP_DELETE_TYPE] = true;

  function notifyFunction(object, name) {
    if (typeof Object.observe !== 'function')
      return;

    var notifier = Object.getNotifier(object);
    return function(type, oldValue) {
      var changeRecord = {
        object: object,
        type: type,
        name: name
      };
      if (arguments.length === 2)
        changeRecord.oldValue = oldValue;
      notifier.notify(changeRecord);
    }
  }

  // TODO(rafaelw): It should be possible for the Object.observe case to have
  // every PathObserver used by defineProperty share a single Object.observe
  // callback, and thus get() can simply call observer.deliver() and any changes
  // to any dependent value will be observed.
  PathObserver.defineProperty = function(object, name, descriptor) {
    // TODO(rafaelw): Validate errors
    var obj = descriptor.object;
    var path = getPath(descriptor.path);
    var notify = notifyFunction(object, name);

    var observer = new PathObserver(obj, descriptor.path,
        function(newValue, oldValue) {
          if (notify)
            notify(PROP_UPDATE_TYPE, oldValue);
        }
    );

    Object.defineProperty(object, name, {
      get: function() {
        return path.getValueFrom(obj);
      },
      set: function(newValue) {
        path.setValueFrom(obj, newValue);
      },
      configurable: true
    });

    return {
      close: function() {
        var oldValue = path.getValueFrom(obj);
        if (notify)
          observer.deliver();
        observer.close();
        Object.defineProperty(object, name, {
          value: oldValue,
          writable: true,
          configurable: true
        });
      }
    };
  }

  function diffObjectFromChangeRecords(object, changeRecords, oldValues) {
    var added = {};
    var removed = {};

    for (var i = 0; i < changeRecords.length; i++) {
      var record = changeRecords[i];
      if (!expectedRecordTypes[record.type]) {
        console.error('Unknown changeRecord type: ' + record.type);
        console.error(record);
        continue;
      }

      if (!(record.name in oldValues))
        oldValues[record.name] = record.oldValue;

      if (record.type == PROP_UPDATE_TYPE)
        continue;

      if (record.type == PROP_ADD_TYPE) {
        if (record.name in removed)
          delete removed[record.name];
        else
          added[record.name] = true;

        continue;
      }

      // type = 'delete'
      if (record.name in added) {
        delete added[record.name];
        delete oldValues[record.name];
      } else {
        removed[record.name] = true;
      }
    }

    for (var prop in added)
      added[prop] = object[prop];

    for (var prop in removed)
      removed[prop] = undefined;

    var changed = {};
    for (var prop in oldValues) {
      if (prop in added || prop in removed)
        continue;

      var newValue = object[prop];
      if (oldValues[prop] !== newValue)
        changed[prop] = newValue;
    }

    return {
      added: added,
      removed: removed,
      changed: changed
    };
  }

  function newSplice(index, removed, addedCount) {
    return {
      index: index,
      removed: removed,
      addedCount: addedCount
    };
  }

  var EDIT_LEAVE = 0;
  var EDIT_UPDATE = 1;
  var EDIT_ADD = 2;
  var EDIT_DELETE = 3;

  function ArraySplice() {}

  ArraySplice.prototype = {

    // Note: This function is *based* on the computation of the Levenshtein
    // "edit" distance. The one change is that "updates" are treated as two
    // edits - not one. With Array splices, an update is really a delete
    // followed by an add. By retaining this, we optimize for "keeping" the
    // maximum array items in the original array. For example:
    //
    //   'xxxx123' -> '123yyyy'
    //
    // With 1-edit updates, the shortest path would be just to update all seven
    // characters. With 2-edit updates, we delete 4, leave 3, and add 4. This
    // leaves the substring '123' intact.
    calcEditDistances: function(current, currentStart, currentEnd,
                                old, oldStart, oldEnd) {
      // "Deletion" columns
      var rowCount = oldEnd - oldStart + 1;
      var columnCount = currentEnd - currentStart + 1;
      var distances = new Array(rowCount);

      // "Addition" rows. Initialize null column.
      for (var i = 0; i < rowCount; i++) {
        distances[i] = new Array(columnCount);
        distances[i][0] = i;
      }

      // Initialize null row
      for (var j = 0; j < columnCount; j++)
        distances[0][j] = j;

      for (var i = 1; i < rowCount; i++) {
        for (var j = 1; j < columnCount; j++) {
          if (this.equals(current[currentStart + j - 1], old[oldStart + i - 1]))
            distances[i][j] = distances[i - 1][j - 1];
          else {
            var north = distances[i - 1][j] + 1;
            var west = distances[i][j - 1] + 1;
            distances[i][j] = north < west ? north : west;
          }
        }
      }

      return distances;
    },

    // This starts at the final weight, and walks "backward" by finding
    // the minimum previous weight recursively until the origin of the weight
    // matrix.
    spliceOperationsFromEditDistances: function(distances) {
      var i = distances.length - 1;
      var j = distances[0].length - 1;
      var current = distances[i][j];
      var edits = [];
      while (i > 0 || j > 0) {
        if (i == 0) {
          edits.push(EDIT_ADD);
          j--;
          continue;
        }
        if (j == 0) {
          edits.push(EDIT_DELETE);
          i--;
          continue;
        }
        var northWest = distances[i - 1][j - 1];
        var west = distances[i - 1][j];
        var north = distances[i][j - 1];

        var min;
        if (west < north)
          min = west < northWest ? west : northWest;
        else
          min = north < northWest ? north : northWest;

        if (min == northWest) {
          if (northWest == current) {
            edits.push(EDIT_LEAVE);
          } else {
            edits.push(EDIT_UPDATE);
            current = northWest;
          }
          i--;
          j--;
        } else if (min == west) {
          edits.push(EDIT_DELETE);
          i--;
          current = west;
        } else {
          edits.push(EDIT_ADD);
          j--;
          current = north;
        }
      }

      edits.reverse();
      return edits;
    },

    /**
     * Splice Projection functions:
     *
     * A splice map is a representation of how a previous array of items
     * was transformed into a new array of items. Conceptually it is a list of
     * tuples of
     *
     *   <index, removed, addedCount>
     *
     * which are kept in ascending index order of. The tuple represents that at
     * the |index|, |removed| sequence of items were removed, and counting forward
     * from |index|, |addedCount| items were added.
     */

    /**
     * Lacking individual splice mutation information, the minimal set of
     * splices can be synthesized given the previous state and final state of an
     * array. The basic approach is to calculate the edit distance matrix and
     * choose the shortest path through it.
     *
     * Complexity: O(l * p)
     *   l: The length of the current array
     *   p: The length of the old array
     */
    calcSplices: function(current, currentStart, currentEnd,
                          old, oldStart, oldEnd) {
      var prefixCount = 0;
      var suffixCount = 0;

      var minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);
      if (currentStart == 0 && oldStart == 0)
        prefixCount = this.sharedPrefix(current, old, minLength);

      if (currentEnd == current.length && oldEnd == old.length)
        suffixCount = this.sharedSuffix(current, old, minLength - prefixCount);

      currentStart += prefixCount;
      oldStart += prefixCount;
      currentEnd -= suffixCount;
      oldEnd -= suffixCount;

      if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)
        return [];

      if (currentStart == currentEnd) {
        var splice = newSplice(currentStart, [], 0);
        while (oldStart < oldEnd)
          splice.removed.push(old[oldStart++]);

        return [ splice ];
      } else if (oldStart == oldEnd)
        return [ newSplice(currentStart, [], currentEnd - currentStart) ];

      var ops = this.spliceOperationsFromEditDistances(
          this.calcEditDistances(current, currentStart, currentEnd,
                                 old, oldStart, oldEnd));

      var splice = undefined;
      var splices = [];
      var index = currentStart;
      var oldIndex = oldStart;
      for (var i = 0; i < ops.length; i++) {
        switch(ops[i]) {
          case EDIT_LEAVE:
            if (splice) {
              splices.push(splice);
              splice = undefined;
            }

            index++;
            oldIndex++;
            break;
          case EDIT_UPDATE:
            if (!splice)
              splice = newSplice(index, [], 0);

            splice.addedCount++;
            index++;

            splice.removed.push(old[oldIndex]);
            oldIndex++;
            break;
          case EDIT_ADD:
            if (!splice)
              splice = newSplice(index, [], 0);

            splice.addedCount++;
            index++;
            break;
          case EDIT_DELETE:
            if (!splice)
              splice = newSplice(index, [], 0);

            splice.removed.push(old[oldIndex]);
            oldIndex++;
            break;
        }
      }

      if (splice) {
        splices.push(splice);
      }
      return splices;
    },

    sharedPrefix: function(current, old, searchLength) {
      for (var i = 0; i < searchLength; i++)
        if (!this.equals(current[i], old[i]))
          return i;
      return searchLength;
    },

    sharedSuffix: function(current, old, searchLength) {
      var index1 = current.length;
      var index2 = old.length;
      var count = 0;
      while (count < searchLength && this.equals(current[--index1], old[--index2]))
        count++;

      return count;
    },

    calculateSplices: function(current, previous) {
      return this.calcSplices(current, 0, current.length, previous, 0,
                              previous.length);
    },

    equals: function(currentValue, previousValue) {
      return currentValue === previousValue;
    }
  };

  var arraySplice = new ArraySplice();

  function calcSplices(current, currentStart, currentEnd,
                       old, oldStart, oldEnd) {
    return arraySplice.calcSplices(current, currentStart, currentEnd,
                                   old, oldStart, oldEnd);
  }

  function intersect(start1, end1, start2, end2) {
    // Disjoint
    if (end1 < start2 || end2 < start1)
      return -1;

    // Adjacent
    if (end1 == start2 || end2 == start1)
      return 0;

    // Non-zero intersect, span1 first
    if (start1 < start2) {
      if (end1 < end2)
        return end1 - start2; // Overlap
      else
        return end2 - start2; // Contained
    } else {
      // Non-zero intersect, span2 first
      if (end2 < end1)
        return end2 - start1; // Overlap
      else
        return end1 - start1; // Contained
    }
  }

  function mergeSplice(splices, index, removed, addedCount) {

    var splice = newSplice(index, removed, addedCount);

    var inserted = false;
    var insertionOffset = 0;

    for (var i = 0; i < splices.length; i++) {
      var current = splices[i];
      current.index += insertionOffset;

      if (inserted)
        continue;

      var intersectCount = intersect(splice.index,
                                     splice.index + splice.removed.length,
                                     current.index,
                                     current.index + current.addedCount);

      if (intersectCount >= 0) {
        // Merge the two splices

        splices.splice(i, 1);
        i--;

        insertionOffset -= current.addedCount - current.removed.length;

        splice.addedCount += current.addedCount - intersectCount;
        var deleteCount = splice.removed.length +
                          current.removed.length - intersectCount;

        if (!splice.addedCount && !deleteCount) {
          // merged splice is a noop. discard.
          inserted = true;
        } else {
          var removed = current.removed;

          if (splice.index < current.index) {
            // some prefix of splice.removed is prepended to current.removed.
            var prepend = splice.removed.slice(0, current.index - splice.index);
            Array.prototype.push.apply(prepend, removed);
            removed = prepend;
          }

          if (splice.index + splice.removed.length > current.index + current.addedCount) {
            // some suffix of splice.removed is appended to current.removed.
            var append = splice.removed.slice(current.index + current.addedCount - splice.index);
            Array.prototype.push.apply(removed, append);
          }

          splice.removed = removed;
          if (current.index < splice.index) {
            splice.index = current.index;
          }
        }
      } else if (splice.index < current.index) {
        // Insert splice here.

        inserted = true;

        splices.splice(i, 0, splice);
        i++;

        var offset = splice.addedCount - splice.removed.length
        current.index += offset;
        insertionOffset += offset;
      }
    }

    if (!inserted)
      splices.push(splice);
  }

  function createInitialSplices(array, changeRecords) {
    var splices = [];

    for (var i = 0; i < changeRecords.length; i++) {
      var record = changeRecords[i];
      switch(record.type) {
        case ARRAY_SPLICE_TYPE:
          mergeSplice(splices, record.index, record.removed.slice(), record.addedCount);
          break;
        case PROP_ADD_TYPE:
        case PROP_UPDATE_TYPE:
        case PROP_DELETE_TYPE:
          if (!isIndex(record.name))
            continue;
          var index = toNumber(record.name);
          if (index < 0)
            continue;
          mergeSplice(splices, index, [record.oldValue], 1);
          break;
        default:
          console.error('Unexpected record type: ' + JSON.stringify(record));
          break;
      }
    }

    return splices;
  }

  function projectArraySplices(array, changeRecords) {
    var splices = [];

    createInitialSplices(array, changeRecords).forEach(function(splice) {
      if (splice.addedCount == 1 && splice.removed.length == 1) {
        if (splice.removed[0] !== array[splice.index])
          splices.push(splice);

        return
      };

      splices = splices.concat(calcSplices(array, splice.index, splice.index + splice.addedCount,
                                           splice.removed, 0, splice.removed.length));
    });

    return splices;
  }

  global.Observer = Observer;
  global.Observer.hasObjectObserve = hasObserve;
  global.ArrayObserver = ArrayObserver;
  global.ArrayObserver.calculateSplices = function(current, previous) {
    return arraySplice.calculateSplices(current, previous);
  };

  global.ArraySplice = ArraySplice;
  global.ObjectObserver = ObjectObserver;
  global.PathObserver = PathObserver;
  global.CompoundPathObserver = CompoundPathObserver;
  global.Path = Path;

  // TODO(rafaelw): Only needed for testing until new change record names
  // make it to release.
  global.Observer.changeRecordTypes = {
    add: PROP_ADD_TYPE,
    update: PROP_UPDATE_TYPE,
    reconfigure: PROP_RECONFIGURE_TYPE,
    'delete': PROP_DELETE_TYPE,
    splice: ARRAY_SPLICE_TYPE
  };
})(typeof global !== 'undefined' && global ? global : this);

/*
 * Copyright 2012 The Polymer Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */

if (typeof WeakMap === 'undefined') {
  (function() {
    var defineProperty = Object.defineProperty;
    var counter = Date.now() % 1e9;

    var WeakMap = function() {
      this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
    };

    WeakMap.prototype = {
      set: function(key, value) {
        var entry = key[this.name];
        if (entry && entry[0] === key)
          entry[1] = value;
        else
          defineProperty(key, this.name, {value: [key, value], writable: true});
      },
      get: function(key) {
        var entry;
        return (entry = key[this.name]) && entry[0] === key ?
            entry[1] : undefined;
      },
      delete: function(key) {
        this.set(key, undefined);
      }
    };

    window.WeakMap = WeakMap;
  })();
}

// Copyright 2012 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

var ShadowDOMPolyfill = {};

(function(scope) {
  'use strict';

  var constructorTable = new WeakMap();
  var nativePrototypeTable = new WeakMap();
  var wrappers = Object.create(null);

  // Don't test for eval if document has CSP securityPolicy object and we can
  // see that eval is not supported. This avoids an error message in console
  // even when the exception is caught
  var hasEval = !('securityPolicy' in document) ||
      document.securityPolicy.allowsEval;
  if (hasEval) {
    try {
      var f = new Function('', 'return true;');
      hasEval = f();
    } catch (ex) {
      hasEval = false;
    }
  }

  function assert(b) {
    if (!b)
      throw new Error('Assertion failed');
  };

  function mixin(to, from) {
    Object.getOwnPropertyNames(from).forEach(function(name) {
      Object.defineProperty(to, name,
                            Object.getOwnPropertyDescriptor(from, name));
    });
    return to;
  };

  function mixinStatics(to, from) {
    Object.getOwnPropertyNames(from).forEach(function(name) {
      switch (name) {
        case 'arguments':
        case 'caller':
        case 'length':
        case 'name':
        case 'prototype':
        case 'toString':
          return;
      }
      Object.defineProperty(to, name,
                            Object.getOwnPropertyDescriptor(from, name));
    });
    return to;
  };

  function oneOf(object, propertyNames) {
    for (var i = 0; i < propertyNames.length; i++) {
      if (propertyNames[i] in object)
        return propertyNames[i];
    }
  }

  // Mozilla's old DOM bindings are bretty busted:
  // https://bugzilla.mozilla.org/show_bug.cgi?id=855844
  // Make sure they are create before we start modifying things.
  Object.getOwnPropertyNames(window);

  function getWrapperConstructor(node) {
    var nativePrototype = node.__proto__ || Object.getPrototypeOf(node);
    var wrapperConstructor = constructorTable.get(nativePrototype);
    if (wrapperConstructor)
      return wrapperConstructor;

    var parentWrapperConstructor = getWrapperConstructor(nativePrototype);

    var GeneratedWrapper = createWrapperConstructor(parentWrapperConstructor);
    registerInternal(nativePrototype, GeneratedWrapper, node);

    return GeneratedWrapper;
  }

  function addForwardingProperties(nativePrototype, wrapperPrototype) {
    installProperty(nativePrototype, wrapperPrototype, true);
  }

  function registerInstanceProperties(wrapperPrototype, instanceObject) {
    installProperty(instanceObject, wrapperPrototype, false);
  }

  var isFirefox = /Firefox/.test(navigator.userAgent);

  // This is used as a fallback when getting the descriptor fails in
  // installProperty.
  var dummyDescriptor = {
    get: function() {},
    set: function(v) {},
    configurable: true,
    enumerable: true
  };

  function isEventHandlerName(name) {
    return /^on[a-z]+$/.test(name);
  }

  function isIdentifierName(name) {
    return /^\w[a-zA-Z_0-9]*$/.test(name);
  }

  function getGetter(name) {
    return hasEval && isIdentifierName(name) ?
        new Function('return this.impl.' + name) :
        function() { return this.impl[name]; };
  }

  function getSetter(name) {
    return hasEval && isIdentifierName(name) ?
        new Function('v', 'this.impl.' + name + ' = v') :
        function(v) { this.impl[name] = v; };
  }

  function getMethod(name) {
    return hasEval && isIdentifierName(name) ?
        new Function('return this.impl.' + name +
                     '.apply(this.impl, arguments)') :
        function() { return this.impl[name].apply(this.impl, arguments); };
  }

  function installProperty(source, target, allowMethod) {
    Object.getOwnPropertyNames(source).forEach(function(name) {
      if (name in target)
        return;

      if (isFirefox) {
        // Tickle Firefox's old bindings.
        source.__lookupGetter__(name);
      }
      var descriptor;
      try {
        descriptor = Object.getOwnPropertyDescriptor(source, name);
      } catch (ex) {
        // JSC and V8 both use data properties instead of accessors which can
        // cause getting the property desciptor to throw an exception.
        // https://bugs.webkit.org/show_bug.cgi?id=49739
        descriptor = dummyDescriptor;
      }
      var getter, setter;
      if (allowMethod && typeof descriptor.value === 'function') {
        target[name] = getMethod(name);
        return;
      }

      var isEvent = isEventHandlerName(name);
      if (isEvent)
        getter = scope.getEventHandlerGetter(name);
      else
        getter = getGetter(name);

      if (descriptor.writable || descriptor.set) {
        if (isEvent)
          setter = scope.getEventHandlerSetter(name);
        else
          setter = getSetter(name);
      }

      Object.defineProperty(target, name, {
        get: getter,
        set: setter,
        configurable: descriptor.configurable,
        enumerable: descriptor.enumerable
      });
    });
  }

  /**
   * @param {Function} nativeConstructor
   * @param {Function} wrapperConstructor
   * @param {Object=} opt_instance If present, this is used to extract
   *     properties from an instance object.
   */
  function register(nativeConstructor, wrapperConstructor, opt_instance) {
    var nativePrototype = nativeConstructor.prototype;
    registerInternal(nativePrototype, wrapperConstructor, opt_instance);
    mixinStatics(wrapperConstructor, nativeConstructor);
  }

  function registerInternal(nativePrototype, wrapperConstructor, opt_instance) {
    var wrapperPrototype = wrapperConstructor.prototype;
    assert(constructorTable.get(nativePrototype) === undefined);

    constructorTable.set(nativePrototype, wrapperConstructor);
    nativePrototypeTable.set(wrapperPrototype, nativePrototype);

    addForwardingProperties(nativePrototype, wrapperPrototype);
    if (opt_instance)
      registerInstanceProperties(wrapperPrototype, opt_instance);
  }

  function isWrapperFor(wrapperConstructor, nativeConstructor) {
    return constructorTable.get(nativeConstructor.prototype) ===
        wrapperConstructor;
  }

  /**
   * Creates a generic wrapper constructor based on |object| and its
   * constructor.
   * Sometimes the constructor does not have an associated instance
   * (CharacterData for example). In that case you can pass the constructor that
   * you want to map the object to using |opt_nativeConstructor|.
   * @param {Node} object
   * @param {Function=} opt_nativeConstructor
   * @return {Function} The generated constructor.
   */
  function registerObject(object) {
    var nativePrototype = Object.getPrototypeOf(object);

    var superWrapperConstructor = getWrapperConstructor(nativePrototype);
    var GeneratedWrapper = createWrapperConstructor(superWrapperConstructor);
    registerInternal(nativePrototype, GeneratedWrapper, object);

    return GeneratedWrapper;
  }

  function createWrapperConstructor(superWrapperConstructor) {
    function GeneratedWrapper(node) {
      superWrapperConstructor.call(this, node);
    }
    GeneratedWrapper.prototype =
        Object.create(superWrapperConstructor.prototype);
    GeneratedWrapper.prototype.constructor = GeneratedWrapper;

    return GeneratedWrapper;
  }

  var OriginalDOMImplementation = window.DOMImplementation;
  var OriginalEvent = window.Event;
  var OriginalNode = window.Node;
  var OriginalWindow = window.Window;
  var OriginalRange = window.Range;
  var OriginalCanvasRenderingContext2D = window.CanvasRenderingContext2D;
  var OriginalWebGLRenderingContext = window.WebGLRenderingContext;

  function isWrapper(object) {
    return object instanceof wrappers.EventTarget ||
           object instanceof wrappers.Event ||
           object instanceof wrappers.Range ||
           object instanceof wrappers.DOMImplementation ||
           object instanceof wrappers.CanvasRenderingContext2D ||
           wrappers.WebGLRenderingContext &&
               object instanceof wrappers.WebGLRenderingContext;
  }

  function isNative(object) {
    return object instanceof OriginalNode ||
           object instanceof OriginalEvent ||
           object instanceof OriginalWindow ||
           object instanceof OriginalRange ||
           object instanceof OriginalDOMImplementation ||
           object instanceof OriginalCanvasRenderingContext2D ||
           OriginalWebGLRenderingContext &&
               object instanceof OriginalWebGLRenderingContext;
  }

  /**
   * Wraps a node in a WrapperNode. If there already exists a wrapper for the
   * |node| that wrapper is returned instead.
   * @param {Node} node
   * @return {WrapperNode}
   */
  function wrap(impl) {
    if (impl === null)
      return null;

    assert(isNative(impl));
    return impl.polymerWrapper_ ||
        (impl.polymerWrapper_ = new (getWrapperConstructor(impl))(impl));
  }

  /**
   * Unwraps a wrapper and returns the node it is wrapping.
   * @param {WrapperNode} wrapper
   * @return {Node}
   */
  function unwrap(wrapper) {
    if (wrapper === null)
      return null;
    assert(isWrapper(wrapper));
    return wrapper.impl;
  }

  /**
   * Unwraps object if it is a wrapper.
   * @param {Object} object
   * @return {Object} The native implementation object.
   */
  function unwrapIfNeeded(object) {
    return object && isWrapper(object) ? unwrap(object) : object;
  }

  /**
   * Wraps object if it is not a wrapper.
   * @param {Object} object
   * @return {Object} The wrapper for object.
   */
  function wrapIfNeeded(object) {
    return object && !isWrapper(object) ? wrap(object) : object;
  }

  /**
   * Overrides the current wrapper (if any) for node.
   * @param {Node} node
   * @param {WrapperNode=} wrapper If left out the wrapper will be created as
   *     needed next time someone wraps the node.
   */
  function rewrap(node, wrapper) {
    if (wrapper === null)
      return;
    assert(isNative(node));
    assert(wrapper === undefined || isWrapper(wrapper));
    node.polymerWrapper_ = wrapper;
  }

  function defineGetter(constructor, name, getter) {
    Object.defineProperty(constructor.prototype, name, {
      get: getter,
      configurable: true,
      enumerable: true
    });
  }

  function defineWrapGetter(constructor, name) {
    defineGetter(constructor, name, function() {
      return wrap(this.impl[name]);
    });
  }

  /**
   * Forwards existing methods on the native object to the wrapper methods.
   * This does not wrap any of the arguments or the return value since the
   * wrapper implementation already takes care of that.
   * @param {Array.<Function>} constructors
   * @parem {Array.<string>} names
   */
  function forwardMethodsToWrapper(constructors, names) {
    constructors.forEach(function(constructor) {
      names.forEach(function(name) {
        constructor.prototype[name] = function() {
          var w = wrapIfNeeded(this);
          return w[name].apply(w, arguments);
        };
      });
    });
  }

  scope.assert = assert;
  scope.constructorTable = constructorTable;
  scope.defineGetter = defineGetter;
  scope.defineWrapGetter = defineWrapGetter;
  scope.forwardMethodsToWrapper = forwardMethodsToWrapper;
  scope.isWrapperFor = isWrapperFor;
  scope.mixin = mixin;
  scope.nativePrototypeTable = nativePrototypeTable;
  scope.oneOf = oneOf;
  scope.registerObject = registerObject;
  scope.registerWrapper = register;
  scope.rewrap = rewrap;
  scope.unwrap = unwrap;
  scope.unwrapIfNeeded = unwrapIfNeeded;
  scope.wrap = wrap;
  scope.wrapIfNeeded = wrapIfNeeded;
  scope.wrappers = wrappers;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;
  var wrappers = scope.wrappers;

  var wrappedFuns = new WeakMap();
  var listenersTable = new WeakMap();
  var handledEventsTable = new WeakMap();
  var targetTable = new WeakMap();
  var currentTargetTable = new WeakMap();
  var relatedTargetTable = new WeakMap();
  var eventPhaseTable = new WeakMap();
  var stopPropagationTable = new WeakMap();
  var stopImmediatePropagationTable = new WeakMap();
  var eventHandlersTable = new WeakMap();
  var eventPathTable = new WeakMap();

  function isShadowRoot(node) {
    return node instanceof wrappers.ShadowRoot;
  }

  function isInsertionPoint(node) {
    var localName = node.localName;
    return localName === 'content' || localName === 'shadow';
  }

  function isShadowHost(node) {
    return !!node.shadowRoot;
  }

  function getEventParent(node) {
    var dv;
    return node.parentNode || (dv = node.defaultView) && wrap(dv) || null;
  }

  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-adjusted-parent
  function calculateParents(node, context, ancestors) {
    if (ancestors.length)
      return ancestors.shift();

    // 1.
    if (isShadowRoot(node))
      return getInsertionParent(node) || node.host;

    // 2.
    var eventParents = scope.eventParentsTable.get(node);
    if (eventParents) {
      // Copy over the remaining event parents for next iteration.
      for (var i = 1; i < eventParents.length; i++) {
        ancestors[i - 1] = eventParents[i];
      }
      return eventParents[0];
    }

    // 3.
    if (context && isInsertionPoint(node)) {
      var parentNode = node.parentNode;
      if (parentNode && isShadowHost(parentNode)) {
        var trees = scope.getShadowTrees(parentNode);
        var p = getInsertionParent(context);
        for (var i = 0; i < trees.length; i++) {
          if (trees[i].contains(p))
            return p;
        }
      }
    }

    return getEventParent(node);
  }

  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#event-retargeting
  function retarget(node) {
    var stack = [];  // 1.
    var ancestor = node;  // 2.
    var targets = [];
    var ancestors = [];
    while (ancestor) {  // 3.
      var context = null;  // 3.2.
      // TODO(arv): Change order of these. If the stack is empty we always end
      // up pushing ancestor, no matter what.
      if (isInsertionPoint(ancestor)) {  // 3.1.
        context = topMostNotInsertionPoint(stack);  // 3.1.1.
        var top = stack[stack.length - 1] || ancestor;  // 3.1.2.
        stack.push(top);
      } else if (!stack.length) {
        stack.push(ancestor);  // 3.3.
      }
      var target = stack[stack.length - 1];  // 3.4.
      targets.push({target: target, currentTarget: ancestor});  // 3.5.
      if (isShadowRoot(ancestor))  // 3.6.
        stack.pop();  // 3.6.1.

      ancestor = calculateParents(ancestor, context, ancestors);  // 3.7.
    }
    return targets;
  }

  function topMostNotInsertionPoint(stack) {
    for (var i = stack.length - 1; i >= 0; i--) {
      if (!isInsertionPoint(stack[i]))
        return stack[i];
    }
    return null;
  }

  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-adjusted-related-target
  function adjustRelatedTarget(target, related) {
    var ancestors = [];
    while (target) {  // 3.
      var stack = [];  // 3.1.
      var ancestor = related;  // 3.2.
      var last = undefined;  // 3.3. Needs to be reset every iteration.
      while (ancestor) {
        var context = null;
        if (!stack.length) {
          stack.push(ancestor);
        } else {
          if (isInsertionPoint(ancestor)) {  // 3.4.3.
            context = topMostNotInsertionPoint(stack);
            // isDistributed is more general than checking whether last is
            // assigned into ancestor.
            if (isDistributed(last)) {  // 3.4.3.2.
              var head = stack[stack.length - 1];
              stack.push(head);
            }
          }
        }

        if (inSameTree(ancestor, target))  // 3.4.4.
          return stack[stack.length - 1];

        if (isShadowRoot(ancestor))  // 3.4.5.
          stack.pop();

        last = ancestor;  // 3.4.6.
        ancestor = calculateParents(ancestor, context, ancestors);  // 3.4.7.
      }
      if (isShadowRoot(target))  // 3.5.
        target = target.host;
      else
        target = target.parentNode;  // 3.6.
    }
  }

  function getInsertionParent(node) {
    return scope.insertionParentTable.get(node);
  }

  function isDistributed(node) {
    return getInsertionParent(node);
  }

  function rootOfNode(node) {
    var p;
    while (p = node.parentNode) {
      node = p;
    }
    return node;
  }

  function inSameTree(a, b) {
    return rootOfNode(a) === rootOfNode(b);
  }

  function enclosedBy(a, b) {
    if (a === b)
      return true;
    if (a instanceof wrappers.ShadowRoot)
      return enclosedBy(rootOfNode(a.host), b);
    return false;
  }

  var mutationEventsAreSilenced = 0;

  function muteMutationEvents() {
    mutationEventsAreSilenced++;
  }

  function unmuteMutationEvents() {
    mutationEventsAreSilenced--;
  }

  var OriginalMutationEvent = window.MutationEvent;

  function dispatchOriginalEvent(originalEvent) {
    // Make sure this event is only dispatched once.
    if (handledEventsTable.get(originalEvent))
      return;
    handledEventsTable.set(originalEvent, true);

    // Don't do rendering if this is a mutation event since rendering might
    // mutate the DOM which would fire more events and we would most likely
    // just iloop.
    if (originalEvent instanceof OriginalMutationEvent) {
      if (mutationEventsAreSilenced)
        return;
    } else {
      scope.renderAllPending();
    }

    var target = wrap(originalEvent.target);
    var event = wrap(originalEvent);
    return dispatchEvent(event, target);
  }

  function dispatchEvent(event, originalWrapperTarget) {
    var eventPath = retarget(originalWrapperTarget);

    // For window load events the load event is dispatched at the window but
    // the target is set to the document.
    //
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#the-end
    //
    // TODO(arv): Find a less hacky way to do this.
    if (event.type === 'load' &&
        eventPath.length === 2 &&
        eventPath[0].target instanceof wrappers.Document) {
      eventPath.shift();
    }

    eventPathTable.set(event, eventPath);

    if (dispatchCapturing(event, eventPath)) {
      if (dispatchAtTarget(event, eventPath)) {
        dispatchBubbling(event, eventPath);
      }
    }

    eventPhaseTable.set(event, Event.NONE);
    currentTargetTable.set(event, null);

    return event.defaultPrevented;
  }

  function dispatchCapturing(event, eventPath) {
    var phase;

    for (var i = eventPath.length - 1; i > 0; i--) {
      var target = eventPath[i].target;
      var currentTarget = eventPath[i].currentTarget;
      if (target === currentTarget)
        continue;

      phase = Event.CAPTURING_PHASE;
      if (!invoke(eventPath[i], event, phase))
        return false;
    }

    return true;
  }

  function dispatchAtTarget(event, eventPath) {
    var phase = Event.AT_TARGET;
    return invoke(eventPath[0], event, phase);
  }

  function dispatchBubbling(event, eventPath) {
    var bubbles = event.bubbles;
    var phase;

    for (var i = 1; i < eventPath.length; i++) {
      var target = eventPath[i].target;
      var currentTarget = eventPath[i].currentTarget;
      if (target === currentTarget)
        phase = Event.AT_TARGET;
      else if (bubbles && !stopImmediatePropagationTable.get(event))
        phase = Event.BUBBLING_PHASE;
      else
        continue;

      if (!invoke(eventPath[i], event, phase))
        return;
    }
  }

  function invoke(tuple, event, phase) {
    var target = tuple.target;
    var currentTarget = tuple.currentTarget;

    var listeners = listenersTable.get(currentTarget);
    if (!listeners)
      return true;

    if ('relatedTarget' in event) {
      var originalEvent = unwrap(event);
      // X-Tag sets relatedTarget on a CustomEvent. If they do that there is no
      // way to have relatedTarget return the adjusted target but worse is that
      // the originalEvent might not have a relatedTarget so we hit an assert
      // when we try to wrap it.
      if (originalEvent.relatedTarget) {
        var relatedTarget = wrap(originalEvent.relatedTarget);

        var adjusted = adjustRelatedTarget(currentTarget, relatedTarget);
        if (adjusted === target)
          return true;

        relatedTargetTable.set(event, adjusted);
      }
    }

    eventPhaseTable.set(event, phase);
    var type = event.type;

    var anyRemoved = false;
    targetTable.set(event, target);
    currentTargetTable.set(event, currentTarget);

    for (var i = 0; i < listeners.length; i++) {
      var listener = listeners[i];
      if (listener.removed) {
        anyRemoved = true;
        continue;
      }

      if (listener.type !== type ||
          !listener.capture && phase === Event.CAPTURING_PHASE ||
          listener.capture && phase === Event.BUBBLING_PHASE) {
        continue;
      }

      try {
        if (typeof listener.handler === 'function')
          listener.handler.call(currentTarget, event);
        else
          listener.handler.handleEvent(event);

        if (stopImmediatePropagationTable.get(event))
          return false;

      } catch (ex) {
        if (window.onerror)
          window.onerror(ex.message);
        else
          console.error(ex, ex.stack);
      }
    }

    if (anyRemoved) {
      var copy = listeners.slice();
      listeners.length = 0;
      for (var i = 0; i < copy.length; i++) {
        if (!copy[i].removed)
          listeners.push(copy[i]);
      }
    }

    return !stopPropagationTable.get(event);
  }

  function Listener(type, handler, capture) {
    this.type = type;
    this.handler = handler;
    this.capture = Boolean(capture);
  }
  Listener.prototype = {
    equals: function(that) {
      return this.handler === that.handler && this.type === that.type &&
          this.capture === that.capture;
    },
    get removed() {
      return this.handler === null;
    },
    remove: function() {
      this.handler = null;
    }
  };

  var OriginalEvent = window.Event;

  /**
   * Creates a new Event wrapper or wraps an existin native Event object.
   * @param {string|Event} type
   * @param {Object=} options
   * @constructor
   */
  function Event(type, options) {
    if (type instanceof OriginalEvent)
      this.impl = type;
    else
      return wrap(constructEvent(OriginalEvent, 'Event', type, options));
  }
  Event.prototype = {
    get target() {
      return targetTable.get(this);
    },
    get currentTarget() {
      return currentTargetTable.get(this);
    },
    get eventPhase() {
      return eventPhaseTable.get(this);
    },
    get path() {
      var nodeList = new wrappers.NodeList();
      var eventPath = eventPathTable.get(this);
      if (eventPath) {
        var index = 0;
        var lastIndex = eventPath.length - 1;
        var baseRoot = rootOfNode(currentTargetTable.get(this));

        for (var i = 0; i <= lastIndex; i++) {
          var currentTarget = eventPath[i].currentTarget;
          var currentRoot = rootOfNode(currentTarget);
          if (enclosedBy(baseRoot, currentRoot) &&
              // Make sure we do not add Window to the path.
              (i !== lastIndex || currentTarget instanceof wrappers.Node)) {
            nodeList[index++] = currentTarget;
          }
        }
        nodeList.length = index;
      }
      return nodeList;
    },
    stopPropagation: function() {
      stopPropagationTable.set(this, true);
    },
    stopImmediatePropagation: function() {
      stopPropagationTable.set(this, true);
      stopImmediatePropagationTable.set(this, true);
    }
  };
  registerWrapper(OriginalEvent, Event, document.createEvent('Event'));

  function unwrapOptions(options) {
    if (!options || !options.relatedTarget)
      return options;
    return Object.create(options, {
      relatedTarget: {value: unwrap(options.relatedTarget)}
    });
  }

  function registerGenericEvent(name, SuperEvent, prototype) {
    var OriginalEvent = window[name];
    var GenericEvent = function(type, options) {
      if (type instanceof OriginalEvent)
        this.impl = type;
      else
        return wrap(constructEvent(OriginalEvent, name, type, options));
    };
    GenericEvent.prototype = Object.create(SuperEvent.prototype);
    if (prototype)
      mixin(GenericEvent.prototype, prototype);
    if (OriginalEvent) {
      // IE does not support event constructors but FocusEvent can only be
      // created using new FocusEvent in Firefox.
      // https://bugzilla.mozilla.org/show_bug.cgi?id=882165
      if (OriginalEvent.prototype['init' + name]) {
        registerWrapper(OriginalEvent, GenericEvent,
                        document.createEvent(name));
      } else {
        registerWrapper(OriginalEvent, GenericEvent, new OriginalEvent('temp'));
      }
    }
    return GenericEvent;
  }

  var UIEvent = registerGenericEvent('UIEvent', Event);
  var CustomEvent = registerGenericEvent('CustomEvent', Event);

  var relatedTargetProto = {
    get relatedTarget() {
      return relatedTargetTable.get(this) || wrap(unwrap(this).relatedTarget);
    }
  };

  function getInitFunction(name, relatedTargetIndex) {
    return function() {
      arguments[relatedTargetIndex] = unwrap(arguments[relatedTargetIndex]);
      var impl = unwrap(this);
      impl[name].apply(impl, arguments);
    };
  }

  var mouseEventProto = mixin({
    initMouseEvent: getInitFunction('initMouseEvent', 14)
  }, relatedTargetProto);

  var focusEventProto = mixin({
    initFocusEvent: getInitFunction('initFocusEvent', 5)
  }, relatedTargetProto);

  var MouseEvent = registerGenericEvent('MouseEvent', UIEvent, mouseEventProto);
  var FocusEvent = registerGenericEvent('FocusEvent', UIEvent, focusEventProto);

  var MutationEvent = registerGenericEvent('MutationEvent', Event, {
    initMutationEvent: getInitFunction('initMutationEvent', 3),
    get relatedNode() {
      return wrap(this.impl.relatedNode);
    },
  });

  // In case the browser does not support event constructors we polyfill that
  // by calling `createEvent('Foo')` and `initFooEvent` where the arguments to
  // `initFooEvent` are derived from the registered default event init dict.
  var defaultInitDicts = Object.create(null);

  var supportsEventConstructors = (function() {
    try {
      new window.MouseEvent('click');
    } catch (ex) {
      return false;
    }
    return true;
  })();

  /**
   * Constructs a new native event.
   */
  function constructEvent(OriginalEvent, name, type, options) {
    if (supportsEventConstructors)
      return new OriginalEvent(type, unwrapOptions(options));

    // Create the arguments from the default dictionary.
    var event = unwrap(document.createEvent(name));
    var defaultDict = defaultInitDicts[name];
    var args = [type];
    Object.keys(defaultDict).forEach(function(key) {
      var v = options != null && key in options ?
          options[key] : defaultDict[key];
      if (key === 'relatedTarget')
        v = unwrap(v);
      args.push(v);
    });
    event['init' + name].apply(event, args);
    return event;
  }

  if (!supportsEventConstructors) {
    var configureEventConstructor = function(name, initDict, superName) {
      if (superName) {
        var superDict = defaultInitDicts[superName];
        initDict = mixin(mixin({}, superDict), initDict);
      }

      defaultInitDicts[name] = initDict;
    };

    // The order of the default event init dictionary keys is important, the
    // arguments to initFooEvent is derived from that.
    configureEventConstructor('Event', {bubbles: false, cancelable: false});
    configureEventConstructor('CustomEvent', {detail: null}, 'Event');
    configureEventConstructor('UIEvent', {view: null, detail: 0}, 'Event');
    configureEventConstructor('MouseEvent', {
      screenX: 0,
      screenY: 0,
      clientX: 0,
      clientY: 0,
      ctrlKey: false,
      altKey: false,
      shiftKey: false,
      metaKey: false,
      button: 0,
      relatedTarget: null
    }, 'UIEvent');
    configureEventConstructor('FocusEvent', {relatedTarget: null}, 'UIEvent');
  }

  function isValidListener(fun) {
    if (typeof fun === 'function')
      return true;
    return fun && fun.handleEvent;
  }

  var OriginalEventTarget = window.EventTarget;

  /**
   * This represents a wrapper for an EventTarget.
   * @param {!EventTarget} impl The original event target.
   * @constructor
   */
  function EventTarget(impl) {
    this.impl = impl;
  }

  // Node and Window have different internal type checks in WebKit so we cannot
  // use the same method as the original function.
  var methodNames = [
    'addEventListener',
    'removeEventListener',
    'dispatchEvent'
  ];

  [Node, Window].forEach(function(constructor) {
    var p = constructor.prototype;
    methodNames.forEach(function(name) {
      Object.defineProperty(p, name + '_', {value: p[name]});
    });
  });

  function getTargetToListenAt(wrapper) {
    if (wrapper instanceof wrappers.ShadowRoot)
      wrapper = wrapper.host;
    return unwrap(wrapper);
  }

  EventTarget.prototype = {
    addEventListener: function(type, fun, capture) {
      if (!isValidListener(fun))
        return;

      var listener = new Listener(type, fun, capture);
      var listeners = listenersTable.get(this);
      if (!listeners) {
        listeners = [];
        listenersTable.set(this, listeners);
      } else {
        // Might have a duplicate.
        for (var i = 0; i < listeners.length; i++) {
          if (listener.equals(listeners[i]))
            return;
        }
      }

      listeners.push(listener);

      var target = getTargetToListenAt(this);
      target.addEventListener_(type, dispatchOriginalEvent, true);
    },
    removeEventListener: function(type, fun, capture) {
      capture = Boolean(capture);
      var listeners = listenersTable.get(this);
      if (!listeners)
        return;
      var count = 0, found = false;
      for (var i = 0; i < listeners.length; i++) {
        if (listeners[i].type === type && listeners[i].capture === capture) {
          count++;
          if (listeners[i].handler === fun) {
            found = true;
            listeners[i].remove();
          }
        }
      }

      if (found && count === 1) {
        var target = getTargetToListenAt(this);
        target.removeEventListener_(type, dispatchOriginalEvent, true);
      }
    },
    dispatchEvent: function(event) {
      var target = getTargetToListenAt(this);
      var nativeEvent = unwrap(event);
      // Allow dispatching the same event again. This is safe because if user
      // code calls this during an existing dispatch of the same event the
      // native dispatchEvent throws (that is required by the spec).
      handledEventsTable.set(nativeEvent, false);
      return target.dispatchEvent_(nativeEvent);
    }
  };

  if (OriginalEventTarget)
    registerWrapper(OriginalEventTarget, EventTarget);

  function wrapEventTargetMethods(constructors) {
    forwardMethodsToWrapper(constructors, methodNames);
  }

  var originalElementFromPoint = document.elementFromPoint;

  function elementFromPoint(self, document, x, y) {
    scope.renderAllPending();

    var element = wrap(originalElementFromPoint.call(document.impl, x, y));
    var targets = retarget(element, this)
    for (var i = 0; i < targets.length; i++) {
      var target = targets[i];
      if (target.currentTarget === self)
        return target.target;
    }
    return null;
  }

  /**
   * Returns a function that is to be used as a getter for `onfoo` properties.
   * @param {string} name
   * @return {Function}
   */
  function getEventHandlerGetter(name) {
    return function() {
      var inlineEventHandlers = eventHandlersTable.get(this);
      return inlineEventHandlers && inlineEventHandlers[name] &&
          inlineEventHandlers[name].value || null;
     };
  }

  /**
   * Returns a function that is to be used as a setter for `onfoo` properties.
   * @param {string} name
   * @return {Function}
   */
  function getEventHandlerSetter(name) {
    var eventType = name.slice(2);
    return function(value) {
      var inlineEventHandlers = eventHandlersTable.get(this);
      if (!inlineEventHandlers) {
        inlineEventHandlers = Object.create(null);
        eventHandlersTable.set(this, inlineEventHandlers);
      }

      var old = inlineEventHandlers[name];
      if (old)
        this.removeEventListener(eventType, old.wrapped, false);

      if (typeof value === 'function') {
        var wrapped = function(e) {
          var rv = value.call(this, e);
          if (rv === false)
            e.preventDefault();
          else if (name === 'onbeforeunload' && typeof rv === 'string')
            e.returnValue = rv;
          // mouseover uses true for preventDefault but preventDefault for
          // mouseover is ignored by browsers these day.
        };

        this.addEventListener(eventType, wrapped, false);
        inlineEventHandlers[name] = {
          value: value,
          wrapped: wrapped
        };
      }
    };
  }

  scope.adjustRelatedTarget = adjustRelatedTarget;
  scope.elementFromPoint = elementFromPoint;
  scope.getEventHandlerGetter = getEventHandlerGetter;
  scope.getEventHandlerSetter = getEventHandlerSetter;
  scope.muteMutationEvents = muteMutationEvents;
  scope.unmuteMutationEvents = unmuteMutationEvents;
  scope.wrapEventTargetMethods = wrapEventTargetMethods;
  scope.wrappers.CustomEvent = CustomEvent;
  scope.wrappers.Event = Event;
  scope.wrappers.EventTarget = EventTarget;
  scope.wrappers.FocusEvent = FocusEvent;
  scope.wrappers.MouseEvent = MouseEvent;
  scope.wrappers.MutationEvent = MutationEvent;
  scope.wrappers.UIEvent = UIEvent;

})(this.ShadowDOMPolyfill);

// Copyright 2012 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var wrap = scope.wrap;

  function nonEnum(obj, prop) {
    Object.defineProperty(obj, prop, {enumerable: false});
  }

  function NodeList() {
    this.length = 0;
    nonEnum(this, 'length');
  }
  NodeList.prototype = {
    item: function(index) {
      return this[index];
    }
  };
  nonEnum(NodeList.prototype, 'item');

  function wrapNodeList(list) {
    if (list == null)
      return list;
    var wrapperList = new NodeList();
    for (var i = 0, length = list.length; i < length; i++) {
      wrapperList[i] = wrap(list[i]);
    }
    wrapperList.length = length;
    return wrapperList;
  }

  function addWrapNodeListMethod(wrapperConstructor, name) {
    wrapperConstructor.prototype[name] = function() {
      return wrapNodeList(this.impl[name].apply(this.impl, arguments));
    };
  }

  scope.wrappers.NodeList = NodeList;
  scope.addWrapNodeListMethod = addWrapNodeListMethod;
  scope.wrapNodeList = wrapNodeList;

})(this.ShadowDOMPolyfill);
// Copyright 2012 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var EventTarget = scope.wrappers.EventTarget;
  var NodeList = scope.wrappers.NodeList;
  var defineWrapGetter = scope.defineWrapGetter;
  var assert = scope.assert;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;
  var wrapIfNeeded = scope.wrapIfNeeded;

  function assertIsNodeWrapper(node) {
    assert(node instanceof Node);
  }

  /**
   * Collects nodes from a DocumentFragment or a Node for removal followed
   * by an insertion.
   *
   * This updates the internal pointers for node, previousNode and nextNode.
   */
  function collectNodes(node, parentNode, previousNode, nextNode) {
    if (!(node instanceof DocumentFragment)) {
      if (node.parentNode)
        node.parentNode.removeChild(node);
      node.parentNode_ = parentNode;
      node.previousSibling_ = previousNode;
      node.nextSibling_ = nextNode;
      if (previousNode)
        previousNode.nextSibling_ = node;
      if (nextNode)
        nextNode.previousSibling_ = node;
      return [node];
    }

    var nodes = [];
    for (var child = node.firstChild; child; child = child.nextSibling) {
      nodes.push(child);
    }

    for (var i = nodes.length - 1; i >= 0; i--) {
      node.removeChild(nodes[i]);
      nodes[i].parentNode_ = parentNode;
    }

    for (var i = 0; i < nodes.length; i++) {
      nodes[i].previousSibling_ = nodes[i - 1] || previousNode;
      nodes[i].nextSibling_ = nodes[i + 1] || nextNode;
    }

    if (previousNode)
      previousNode.nextSibling_ = nodes[0];
    if (nextNode)
      nextNode.previousSibling_ = nodes[nodes.length - 1];

    return nodes;
  }

  function collectNodesNoNeedToUpdatePointers(node) {
    if (node instanceof DocumentFragment) {
      var nodes = [];
      var i = 0;
      for (var child = node.firstChild; child; child = child.nextSibling) {
        nodes[i++] = child;
      }
      return nodes;
    }
    return [node];
  }

  function nodesWereAdded(nodes) {
    for (var i = 0; i < nodes.length; i++) {
      nodes[i].nodeWasAdded_();
    }
  }

  function ensureSameOwnerDocument(parent, child) {
    var ownerDoc = parent.nodeType === Node.DOCUMENT_NODE ?
        parent : parent.ownerDocument;
    if (ownerDoc !== child.ownerDocument)
      ownerDoc.adoptNode(child);
  }

  function adoptNodesIfNeeded(owner, nodes) {
    if (!nodes.length)
      return;

    var ownerDoc = owner.ownerDocument;

    // All nodes have the same ownerDocument when we get here.
    if (ownerDoc === nodes[0].ownerDocument)
      return;

    for (var i = 0; i < nodes.length; i++) {
      scope.adoptNodeNoRemove(nodes[i], ownerDoc);
    }
  }

  function unwrapNodesForInsertion(owner, nodes) {
    adoptNodesIfNeeded(owner, nodes);
    var length = nodes.length;

    if (length === 1)
      return unwrap(nodes[0]);

    var df = unwrap(owner.ownerDocument.createDocumentFragment());
    for (var i = 0; i < length; i++) {
      df.appendChild(unwrap(nodes[i]));
    }
    return df;
  }

  function removeAllChildNodes(wrapper) {
    if (wrapper.invalidateShadowRenderer()) {
      var childWrapper = wrapper.firstChild;
      while (childWrapper) {
        assert(childWrapper.parentNode === wrapper);
        var nextSibling = childWrapper.nextSibling;
        var childNode = unwrap(childWrapper);
        var parentNode = childNode.parentNode;
        if (parentNode)
          originalRemoveChild.call(parentNode, childNode);
        childWrapper.previousSibling_ = childWrapper.nextSibling_ =
            childWrapper.parentNode_ = null;
        childWrapper = nextSibling;
      }
      wrapper.firstChild_ = wrapper.lastChild_ = null;
    } else {
      var node = unwrap(wrapper);
      var child = node.firstChild;
      var nextSibling;
      while (child) {
        nextSibling = child.nextSibling;
        originalRemoveChild.call(node, child);
        child = nextSibling;
      }
    }
  }

  function invalidateParent(node) {
    var p = node.parentNode;
    return p && p.invalidateShadowRenderer();
  }

  var OriginalNode = window.Node;

  /**
   * This represents a wrapper of a native DOM node.
   * @param {!Node} original The original DOM node, aka, the visual DOM node.
   * @constructor
   * @extends {EventTarget}
   */
  function Node(original) {
    assert(original instanceof OriginalNode);

    EventTarget.call(this, original);

    // These properties are used to override the visual references with the
    // logical ones. If the value is undefined it means that the logical is the
    // same as the visual.

    /**
     * @type {Node|undefined}
     * @private
     */
    this.parentNode_ = undefined;

    /**
     * @type {Node|undefined}
     * @private
     */
    this.firstChild_ = undefined;

    /**
     * @type {Node|undefined}
     * @private
     */
    this.lastChild_ = undefined;

    /**
     * @type {Node|undefined}
     * @private
     */
    this.nextSibling_ = undefined;

    /**
     * @type {Node|undefined}
     * @private
     */
    this.previousSibling_ = undefined;
  };

  var OriginalDocumentFragment = window.DocumentFragment;
  var originalAppendChild = OriginalNode.prototype.appendChild;
  var originalCompareDocumentPosition =
      OriginalNode.prototype.compareDocumentPosition;
  var originalInsertBefore = OriginalNode.prototype.insertBefore;
  var originalRemoveChild = OriginalNode.prototype.removeChild;
  var originalReplaceChild = OriginalNode.prototype.replaceChild;

  var isIe = /Trident/.test(navigator.userAgent);

  var removeChildOriginalHelper = isIe ?
      function(parent, child) {
        try {
          originalRemoveChild.call(parent, child);
        } catch (ex) {
          if (!(parent instanceof OriginalDocumentFragment))
            throw ex;
        }
      } :
      function(parent, child) {
        originalRemoveChild.call(parent, child);
      };

  Node.prototype = Object.create(EventTarget.prototype);
  mixin(Node.prototype, {
    appendChild: function(childWrapper) {
      assertIsNodeWrapper(childWrapper);

      var nodes;

      if (this.invalidateShadowRenderer() || invalidateParent(childWrapper)) {
        var previousNode = this.lastChild;
        var nextNode = null;
        nodes = collectNodes(childWrapper, this, previousNode, nextNode);

        this.lastChild_ = nodes[nodes.length - 1];
        if (!previousNode)
          this.firstChild_ = nodes[0];

        originalAppendChild.call(this.impl, unwrapNodesForInsertion(this, nodes));
      } else {
        nodes = collectNodesNoNeedToUpdatePointers(childWrapper)
        ensureSameOwnerDocument(this, childWrapper);
        originalAppendChild.call(this.impl, unwrap(childWrapper));
      }

      nodesWereAdded(nodes);

      return childWrapper;
    },

    insertBefore: function(childWrapper, refWrapper) {
      // TODO(arv): Unify with appendChild
      if (!refWrapper)
        return this.appendChild(childWrapper);

      assertIsNodeWrapper(childWrapper);
      assertIsNodeWrapper(refWrapper);
      assert(refWrapper.parentNode === this);

      var nodes;

      if (this.invalidateShadowRenderer() || invalidateParent(childWrapper)) {
        var previousNode = refWrapper.previousSibling;
        var nextNode = refWrapper;
        nodes = collectNodes(childWrapper, this, previousNode, nextNode);

        if (this.firstChild === refWrapper)
          this.firstChild_ = nodes[0];

        // insertBefore refWrapper no matter what the parent is?
        var refNode = unwrap(refWrapper);
        var parentNode = refNode.parentNode;

        if (parentNode) {
          originalInsertBefore.call(
              parentNode,
              unwrapNodesForInsertion(this, nodes),
              refNode);
        } else {
          adoptNodesIfNeeded(this, nodes);
        }
      } else {
        nodes = collectNodesNoNeedToUpdatePointers(childWrapper);
        ensureSameOwnerDocument(this, childWrapper);
        originalInsertBefore.call(this.impl, unwrap(childWrapper),
                                  unwrap(refWrapper));
      }

      nodesWereAdded(nodes);

      return childWrapper;
    },

    removeChild: function(childWrapper) {
      assertIsNodeWrapper(childWrapper);
      if (childWrapper.parentNode !== this) {
        // IE has invalid DOM trees at times.
        var found = false;
        var childNodes = this.childNodes;
        for (var ieChild = this.firstChild; ieChild;
             ieChild = ieChild.nextSibling) {
          if (ieChild === childWrapper) {
            found = true;
            break;
          }
        }
        if (!found) {
          // TODO(arv): DOMException
          throw new Error('NotFoundError');
        }
      }

      var childNode = unwrap(childWrapper);
      if (this.invalidateShadowRenderer()) {

        // We need to remove the real node from the DOM before updating the
        // pointers. This is so that that mutation event is dispatched before
        // the pointers have changed.
        var thisFirstChild = this.firstChild;
        var thisLastChild = this.lastChild;
        var childWrapperNextSibling = childWrapper.nextSibling;
        var childWrapperPreviousSibling = childWrapper.previousSibling;

        var parentNode = childNode.parentNode;
        if (parentNode)
          removeChildOriginalHelper(parentNode, childNode);

        if (thisFirstChild === childWrapper)
          this.firstChild_ = childWrapperNextSibling;
        if (thisLastChild === childWrapper)
          this.lastChild_ = childWrapperPreviousSibling;
        if (childWrapperPreviousSibling)
          childWrapperPreviousSibling.nextSibling_ = childWrapperNextSibling;
        if (childWrapperNextSibling) {
          childWrapperNextSibling.previousSibling_ =
              childWrapperPreviousSibling;
        }

        childWrapper.previousSibling_ = childWrapper.nextSibling_ =
            childWrapper.parentNode_ = undefined;
      } else {
        removeChildOriginalHelper(this.impl, childNode);
      }

      return childWrapper;
    },

    replaceChild: function(newChildWrapper, oldChildWrapper) {
      assertIsNodeWrapper(newChildWrapper);
      assertIsNodeWrapper(oldChildWrapper);

      if (oldChildWrapper.parentNode !== this) {
        // TODO(arv): DOMException
        throw new Error('NotFoundError');
      }

      var oldChildNode = unwrap(oldChildWrapper);
      var nodes;

      if (this.invalidateShadowRenderer() ||
          invalidateParent(newChildWrapper)) {
        var previousNode = oldChildWrapper.previousSibling;
        var nextNode = oldChildWrapper.nextSibling;
        if (nextNode === newChildWrapper)
          nextNode = newChildWrapper.nextSibling;
        nodes = collectNodes(newChildWrapper, this, previousNode, nextNode);

        if (this.firstChild === oldChildWrapper)
          this.firstChild_ = nodes[0];
        if (this.lastChild === oldChildWrapper)
          this.lastChild_ = nodes[nodes.length - 1];

        oldChildWrapper.previousSibling_ = oldChildWrapper.nextSibling_ =
            oldChildWrapper.parentNode_ = undefined;

        // replaceChild no matter what the parent is?
        if (oldChildNode.parentNode) {
          originalReplaceChild.call(
              oldChildNode.parentNode,
              unwrapNodesForInsertion(this, nodes),
              oldChildNode);
        }
      } else {
        nodes = collectNodesNoNeedToUpdatePointers(newChildWrapper);
        ensureSameOwnerDocument(this, newChildWrapper);
        originalReplaceChild.call(this.impl, unwrap(newChildWrapper),
                                  oldChildNode);
      }

      nodesWereAdded(nodes);

      return oldChildWrapper;
    },

    /**
     * Called after a node was added. Subclasses override this to invalidate
     * the renderer as needed.
     * @private
     */
    nodeWasAdded_: function() {
      for (var child = this.firstChild; child; child = child.nextSibling) {
        child.nodeWasAdded_();
      }
    },

    hasChildNodes: function() {
      return this.firstChild !== null;
    },

    /** @type {Node} */
    get parentNode() {
      // If the parentNode has not been overridden, use the original parentNode.
      return this.parentNode_ !== undefined ?
          this.parentNode_ : wrap(this.impl.parentNode);
    },

    /** @type {Node} */
    get firstChild() {
      return this.firstChild_ !== undefined ?
          this.firstChild_ : wrap(this.impl.firstChild);
    },

    /** @type {Node} */
    get lastChild() {
      return this.lastChild_ !== undefined ?
          this.lastChild_ : wrap(this.impl.lastChild);
    },

    /** @type {Node} */
    get nextSibling() {
      return this.nextSibling_ !== undefined ?
          this.nextSibling_ : wrap(this.impl.nextSibling);
    },

    /** @type {Node} */
    get previousSibling() {
      return this.previousSibling_ !== undefined ?
          this.previousSibling_ : wrap(this.impl.previousSibling);
    },

    get parentElement() {
      var p = this.parentNode;
      while (p && p.nodeType !== Node.ELEMENT_NODE) {
        p = p.parentNode;
      }
      return p;
    },

    get textContent() {
      // TODO(arv): This should fallback to this.impl.textContent if there
      // are no shadow trees below or above the context node.
      var s = '';
      for (var child = this.firstChild; child; child = child.nextSibling) {
        s += child.textContent;
      }
      return s;
    },
    set textContent(textContent) {
      if (this.invalidateShadowRenderer()) {
        removeAllChildNodes(this);
        if (textContent !== '') {
          var textNode = this.impl.ownerDocument.createTextNode(textContent);
          this.appendChild(textNode);
        }
      } else {
        this.impl.textContent = textContent;
      }
    },

    get childNodes() {
      var wrapperList = new NodeList();
      var i = 0;
      for (var child = this.firstChild; child; child = child.nextSibling) {
        wrapperList[i++] = child;
      }
      wrapperList.length = i;
      return wrapperList;
    },

    cloneNode: function(deep) {
      if (!this.invalidateShadowRenderer())
        return wrap(this.impl.cloneNode(deep));

      var clone = wrap(this.impl.cloneNode(false));
      if (deep) {
        for (var child = this.firstChild; child; child = child.nextSibling) {
          clone.appendChild(child.cloneNode(true));
        }
      }
      // TODO(arv): Some HTML elements also clone other data like value.
      return clone;
    },

    contains: function(child) {
      if (!child)
        return false;

      child = wrapIfNeeded(child);

      // TODO(arv): Optimize using ownerDocument etc.
      if (child === this)
        return true;
      var parentNode = child.parentNode;
      if (!parentNode)
        return false;
      return this.contains(parentNode);
    },

    compareDocumentPosition: function(otherNode) {
      // This only wraps, it therefore only operates on the composed DOM and not
      // the logical DOM.
      return originalCompareDocumentPosition.call(this.impl, unwrap(otherNode));
    }
  });

  defineWrapGetter(Node, 'ownerDocument');

  // We use a DocumentFragment as a base and then delete the properties of
  // DocumentFragment.prototype from the wrapper Node. Since delete makes
  // objects slow in some JS engines we recreate the prototype object.
  registerWrapper(OriginalNode, Node, document.createDocumentFragment());
  delete Node.prototype.querySelector;
  delete Node.prototype.querySelectorAll;
  Node.prototype = mixin(Object.create(EventTarget.prototype), Node.prototype);

  scope.wrappers.Node = Node;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  function findOne(node, selector) {
    var m, el = node.firstElementChild;
    while (el) {
      if (el.matches(selector))
        return el;
      m = findOne(el, selector);
      if (m)
        return m;
      el = el.nextElementSibling;
    }
    return null;
  }

  function findAll(node, selector, results) {
    var el = node.firstElementChild;
    while (el) {
      if (el.matches(selector))
        results[results.length++] = el;
      findAll(el, selector, results);
      el = el.nextElementSibling;
    }
    return results;
  }

  // find and findAll will only match Simple Selectors,
  // Structural Pseudo Classes are not guarenteed to be correct
  // http://www.w3.org/TR/css3-selectors/#simple-selectors

  var SelectorsInterface = {
    querySelector: function(selector) {
      return findOne(this, selector);
    },
    querySelectorAll: function(selector) {
      return findAll(this, selector, new NodeList())
    }
  };

  var GetElementsByInterface = {
    getElementsByTagName: function(tagName) {
      // TODO(arv): Check tagName?
      return this.querySelectorAll(tagName);
    },
    getElementsByClassName: function(className) {
      // TODO(arv): Check className?
      return this.querySelectorAll('.' + className);
    },
    getElementsByTagNameNS: function(ns, tagName) {
      if (ns === '*')
        return this.getElementsByTagName(tagName);

      // TODO(arv): Check tagName?
      var result = new NodeList;
      var els = this.getElementsByTagName(tagName);
      for (var i = 0, j = 0; i < els.length; i++) {
        if (els[i].namespaceURI === ns)
          result[j++] = els[i];
      }
      result.length = j;
      return result;
    }
  };

  scope.GetElementsByInterface = GetElementsByInterface;
  scope.SelectorsInterface = SelectorsInterface;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var NodeList = scope.wrappers.NodeList;

  function forwardElement(node) {
    while (node && node.nodeType !== Node.ELEMENT_NODE) {
      node = node.nextSibling;
    }
    return node;
  }

  function backwardsElement(node) {
    while (node && node.nodeType !== Node.ELEMENT_NODE) {
      node = node.previousSibling;
    }
    return node;
  }

  var ParentNodeInterface = {
    get firstElementChild() {
      return forwardElement(this.firstChild);
    },

    get lastElementChild() {
      return backwardsElement(this.lastChild);
    },

    get childElementCount() {
      var count = 0;
      for (var child = this.firstElementChild;
           child;
           child = child.nextElementSibling) {
        count++;
      }
      return count;
    },

    get children() {
      var wrapperList = new NodeList();
      var i = 0;
      for (var child = this.firstElementChild;
           child;
           child = child.nextElementSibling) {
        wrapperList[i++] = child;
      }
      wrapperList.length = i;
      return wrapperList;
    }
  };

  var ChildNodeInterface = {
    get nextElementSibling() {
      return forwardElement(this.nextSibling);
    },

    get previousElementSibling() {
      return backwardsElement(this.previousSibling);
    }
  };

  scope.ChildNodeInterface = ChildNodeInterface;
  scope.ParentNodeInterface = ParentNodeInterface;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var ChildNodeInterface = scope.ChildNodeInterface;
  var Node = scope.wrappers.Node;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;

  var OriginalCharacterData = window.CharacterData;

  function CharacterData(node) {
    Node.call(this, node);
  }
  CharacterData.prototype = Object.create(Node.prototype);
  mixin(CharacterData.prototype, {
    get textContent() {
      return this.data;
    },
    set textContent(value) {
      this.data = value;
    }
  });

  mixin(CharacterData.prototype, ChildNodeInterface);

  registerWrapper(OriginalCharacterData, CharacterData,
                  document.createTextNode(''));

  scope.wrappers.CharacterData = CharacterData;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var ChildNodeInterface = scope.ChildNodeInterface;
  var GetElementsByInterface = scope.GetElementsByInterface;
  var Node = scope.wrappers.Node;
  var ParentNodeInterface = scope.ParentNodeInterface;
  var SelectorsInterface = scope.SelectorsInterface;
  var addWrapNodeListMethod = scope.addWrapNodeListMethod;
  var mixin = scope.mixin;
  var oneOf = scope.oneOf;
  var registerWrapper = scope.registerWrapper;
  var wrappers = scope.wrappers;

  var OriginalElement = window.Element;

  var matchesName = oneOf(OriginalElement.prototype, [
    'matches',
    'mozMatchesSelector',
    'msMatchesSelector',
    'webkitMatchesSelector',
  ]);

  var originalMatches = OriginalElement.prototype[matchesName];

  function invalidateRendererBasedOnAttribute(element, name) {
    // Only invalidate if parent node is a shadow host.
    var p = element.parentNode;
    if (!p || !p.shadowRoot)
      return;

    var renderer = scope.getRendererForHost(p);
    if (renderer.dependsOnAttribute(name))
      renderer.invalidate();
  }

  function Element(node) {
    Node.call(this, node);
  }
  Element.prototype = Object.create(Node.prototype);
  mixin(Element.prototype, {
    createShadowRoot: function() {
      var newShadowRoot = new wrappers.ShadowRoot(this);
      this.impl.polymerShadowRoot_ = newShadowRoot;

      var renderer = scope.getRendererForHost(this);
      renderer.invalidate();

      return newShadowRoot;
    },

    get shadowRoot() {
      return this.impl.polymerShadowRoot_ || null;
    },

    setAttribute: function(name, value) {
      this.impl.setAttribute(name, value);
      invalidateRendererBasedOnAttribute(this, name);
    },

    removeAttribute: function(name) {
      this.impl.removeAttribute(name);
      invalidateRendererBasedOnAttribute(this, name);
    },

    matches: function(selector) {
      return originalMatches.call(this.impl, selector);
    }
  });

  Element.prototype[matchesName] = function(selector) {
    return this.matches(selector);
  };

  if (OriginalElement.prototype.webkitCreateShadowRoot) {
    Element.prototype.webkitCreateShadowRoot =
        Element.prototype.createShadowRoot;
  }

  /**
   * Useful for generating the accessor pair for a property that reflects an
   * attribute.
   */
  function setterDirtiesAttribute(prototype, propertyName, opt_attrName) {
    var attrName = opt_attrName || propertyName;
    Object.defineProperty(prototype, propertyName, {
      get: function() {
        return this.impl[propertyName];
      },
      set: function(v) {
        this.impl[propertyName] = v;
        invalidateRendererBasedOnAttribute(this, attrName);
      },
      configurable: true,
      enumerable: true
    });
  }

  setterDirtiesAttribute(Element.prototype, 'id');
  setterDirtiesAttribute(Element.prototype, 'className', 'class');

  mixin(Element.prototype, ChildNodeInterface);
  mixin(Element.prototype, GetElementsByInterface);
  mixin(Element.prototype, ParentNodeInterface);
  mixin(Element.prototype, SelectorsInterface);

  registerWrapper(OriginalElement, Element);

  // TODO(arv): Export setterDirtiesAttribute and apply it to more bindings
  // that reflect attributes.
  scope.matchesName = matchesName;
  scope.wrappers.Element = Element;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var Element = scope.wrappers.Element;
  var defineGetter = scope.defineGetter;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;

  /////////////////////////////////////////////////////////////////////////////
  // innerHTML and outerHTML

  var escapeRegExp = /&|<|"/g;

  function escapeReplace(c) {
    switch (c) {
      case '&':
        return '&amp;';
      case '<':
        return '&lt;';
      case '"':
        return '&quot;'
    }
  }

  function escape(s) {
    return s.replace(escapeRegExp, escapeReplace);
  }

  // http://www.whatwg.org/specs/web-apps/current-work/#void-elements
  var voidElements = {
    'area': true,
    'base': true,
    'br': true,
    'col': true,
    'command': true,
    'embed': true,
    'hr': true,
    'img': true,
    'input': true,
    'keygen': true,
    'link': true,
    'meta': true,
    'param': true,
    'source': true,
    'track': true,
    'wbr': true
  };

  function getOuterHTML(node) {
    switch (node.nodeType) {
      case Node.ELEMENT_NODE:
        var tagName = node.tagName.toLowerCase();
        var s = '<' + tagName;
        var attrs = node.attributes;
        for (var i = 0, attr; attr = attrs[i]; i++) {
          s += ' ' + attr.name + '="' + escape(attr.value) + '"';
        }
        s += '>';
        if (voidElements[tagName])
          return s;

        return s + getInnerHTML(node) + '</' + tagName + '>';

      case Node.TEXT_NODE:
        return escape(node.nodeValue);

      case Node.COMMENT_NODE:
        return '<!--' + escape(node.nodeValue) + '-->';
      default:
        console.error(node);
        throw new Error('not implemented');
    }
  }

  function getInnerHTML(node) {
    var s = '';
    for (var child = node.firstChild; child; child = child.nextSibling) {
      s += getOuterHTML(child);
    }
    return s;
  }

  function setInnerHTML(node, value, opt_tagName) {
    var tagName = opt_tagName || 'div';
    node.textContent = '';
    var tempElement = unwrap(node.ownerDocument.createElement(tagName));
    tempElement.innerHTML = value;
    var firstChild;
    while (firstChild = tempElement.firstChild) {
      node.appendChild(wrap(firstChild));
    }
  }

  var OriginalHTMLElement = window.HTMLElement;

  function HTMLElement(node) {
    Element.call(this, node);
  }
  HTMLElement.prototype = Object.create(Element.prototype);
  mixin(HTMLElement.prototype, {
    get innerHTML() {
      // TODO(arv): This should fallback to this.impl.innerHTML if there
      // are no shadow trees below or above the context node.
      return getInnerHTML(this);
    },
    set innerHTML(value) {
      if (this.invalidateShadowRenderer())
        setInnerHTML(this, value, this.tagName);
      else
        this.impl.innerHTML = value;
    },

    get outerHTML() {
      // TODO(arv): This should fallback to HTMLElement_prototype.outerHTML if there
      // are no shadow trees below or above the context node.
      return getOuterHTML(this);
    },
    set outerHTML(value) {
      var p = this.parentNode;
      if (p) {
        p.invalidateShadowRenderer();
        this.impl.outerHTML = value;
      }
    }
  });

  function getter(name) {
    return function() {
      scope.renderAllPending();
      return this.impl[name];
    };
  }

  function getterRequiresRendering(name) {
    defineGetter(HTMLElement, name, getter(name));
  }

  [
    'clientHeight',
    'clientLeft',
    'clientTop',
    'clientWidth',
    'offsetHeight',
    'offsetLeft',
    'offsetTop',
    'offsetWidth',
    'scrollHeight',
    'scrollWidth',
  ].forEach(getterRequiresRendering);

  function getterAndSetterRequiresRendering(name) {
    Object.defineProperty(HTMLElement.prototype, name, {
      get: getter(name),
      set: function(v) {
        scope.renderAllPending();
        this.impl[name] = v;
      },
      configurable: true,
      enumerable: true
    });
  }

  [
    'scrollLeft',
    'scrollTop',
  ].forEach(getterAndSetterRequiresRendering);

  function methodRequiresRendering(name) {
    Object.defineProperty(HTMLElement.prototype, name, {
      value: function() {
        scope.renderAllPending();
        return this.impl[name].apply(this.impl, arguments);
      },
      configurable: true,
      enumerable: true
    });
  }

  [
    'getBoundingClientRect',
    'getClientRects',
    'scrollIntoView'
  ].forEach(methodRequiresRendering);

  // HTMLElement is abstract so we use a subclass that has no members.
  registerWrapper(OriginalHTMLElement, HTMLElement,
                  document.createElement('b'));

  scope.wrappers.HTMLElement = HTMLElement;

  // TODO: Find a better way to share these two with WrapperShadowRoot.
  scope.getInnerHTML = getInnerHTML;
  scope.setInnerHTML = setInnerHTML
})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var wrap = scope.wrap;

  var OriginalHTMLCanvasElement = window.HTMLCanvasElement;

  function HTMLCanvasElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLCanvasElement.prototype = Object.create(HTMLElement.prototype);

  mixin(HTMLCanvasElement.prototype, {
    getContext: function() {
      var context = this.impl.getContext.apply(this.impl, arguments);
      return context && wrap(context);
    }
  });

  registerWrapper(OriginalHTMLCanvasElement, HTMLCanvasElement,
                  document.createElement('canvas'));

  scope.wrappers.HTMLCanvasElement = HTMLCanvasElement;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;

  var OriginalHTMLContentElement = window.HTMLContentElement;

  function HTMLContentElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLContentElement.prototype = Object.create(HTMLElement.prototype);
  mixin(HTMLContentElement.prototype, {
    get select() {
      return this.getAttribute('select');
    },
    set select(value) {
      this.setAttribute('select', value);
    },

    setAttribute: function(n, v) {
      HTMLElement.prototype.setAttribute.call(this, n, v);
      if (String(n).toLowerCase() === 'select')
        this.invalidateShadowRenderer(true);
    }

    // getDistributedNodes is added in ShadowRenderer

    // TODO: attribute boolean resetStyleInheritance;
  });

  if (OriginalHTMLContentElement)
    registerWrapper(OriginalHTMLContentElement, HTMLContentElement);

  scope.wrappers.HTMLContentElement = HTMLContentElement;
})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var rewrap = scope.rewrap;

  var OriginalHTMLImageElement = window.HTMLImageElement;

  function HTMLImageElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLImageElement.prototype = Object.create(HTMLElement.prototype);

  registerWrapper(OriginalHTMLImageElement, HTMLImageElement,
                  document.createElement('img'));

  function Image(width, height) {
    if (!(this instanceof Image)) {
      throw new TypeError(
          'DOM object constructor cannot be called as a function.');
    }

    var node = unwrap(document.createElement('img'));
    HTMLElement.call(this, node);
    rewrap(node, this);

    if (width !== undefined)
      node.width = width;
    if (height !== undefined)
      node.height = height;
  }

  Image.prototype = HTMLImageElement.prototype;

  scope.wrappers.HTMLImageElement = HTMLImageElement;
  scope.wrappers.Image = Image;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;

  var OriginalHTMLShadowElement = window.HTMLShadowElement;

  function HTMLShadowElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLShadowElement.prototype = Object.create(HTMLElement.prototype);
  mixin(HTMLShadowElement.prototype, {
    // TODO: attribute boolean resetStyleInheritance;
  });

  if (OriginalHTMLShadowElement)
    registerWrapper(OriginalHTMLShadowElement, HTMLShadowElement);

  scope.wrappers.HTMLShadowElement = HTMLShadowElement;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var getInnerHTML = scope.getInnerHTML;
  var mixin = scope.mixin;
  var muteMutationEvents = scope.muteMutationEvents;
  var registerWrapper = scope.registerWrapper;
  var setInnerHTML = scope.setInnerHTML;
  var unmuteMutationEvents = scope.unmuteMutationEvents;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;

  var contentTable = new WeakMap();
  var templateContentsOwnerTable = new WeakMap();

  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
  function getTemplateContentsOwner(doc) {
    if (!doc.defaultView)
      return doc;
    var d = templateContentsOwnerTable.get(doc);
    if (!d) {
      // TODO(arv): This should either be a Document or HTMLDocument depending
      // on doc.
      d = doc.implementation.createHTMLDocument('');
      while (d.lastChild) {
        d.removeChild(d.lastChild);
      }
      templateContentsOwnerTable.set(doc, d);
    }
    return d;
  }

  function extractContent(templateElement) {
    // templateElement is not a wrapper here.
    var doc = getTemplateContentsOwner(templateElement.ownerDocument);
    var df = unwrap(doc.createDocumentFragment());
    var child;
    muteMutationEvents();
    while (child = templateElement.firstChild) {
      df.appendChild(child);
    }
    unmuteMutationEvents();
    return df;
  }

  var OriginalHTMLTemplateElement = window.HTMLTemplateElement;

  function HTMLTemplateElement(node) {
    HTMLElement.call(this, node);
    if (!OriginalHTMLTemplateElement) {
      var content = extractContent(node);
      contentTable.set(this, wrap(content));
    }
  }
  HTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);

  mixin(HTMLTemplateElement.prototype, {
    get content() {
      if (OriginalHTMLTemplateElement)
        return wrap(this.impl.content);
      return contentTable.get(this);
    },

    get innerHTML() {
      return getInnerHTML(this.content);
    },
    set innerHTML(value) {
      setInnerHTML(this.content, value);
    }

    // TODO(arv): cloneNode needs to clone content.

  });

  if (OriginalHTMLTemplateElement)
    registerWrapper(OriginalHTMLTemplateElement, HTMLTemplateElement);

  scope.wrappers.HTMLTemplateElement = HTMLTemplateElement;
})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var registerWrapper = scope.registerWrapper;

  var OriginalHTMLMediaElement = window.HTMLMediaElement;

  function HTMLMediaElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLMediaElement.prototype = Object.create(HTMLElement.prototype);

  registerWrapper(OriginalHTMLMediaElement, HTMLMediaElement,
                  document.createElement('audio'));

  scope.wrappers.HTMLMediaElement = HTMLMediaElement;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLMediaElement = scope.wrappers.HTMLMediaElement;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var rewrap = scope.rewrap;

  var OriginalHTMLAudioElement = window.HTMLAudioElement;

  function HTMLAudioElement(node) {
    HTMLMediaElement.call(this, node);
  }
  HTMLAudioElement.prototype = Object.create(HTMLMediaElement.prototype);

  registerWrapper(OriginalHTMLAudioElement, HTMLAudioElement,
                  document.createElement('audio'));

  function Audio(src) {
    if (!(this instanceof Audio)) {
      throw new TypeError(
          'DOM object constructor cannot be called as a function.');
    }

    var node = unwrap(document.createElement('audio'));
    HTMLMediaElement.call(this, node);
    rewrap(node, this);

    node.setAttribute('preload', 'auto');
    if (src !== undefined)
      node.setAttribute('src', src);
  }

  Audio.prototype = HTMLAudioElement.prototype;

  scope.wrappers.HTMLAudioElement = HTMLAudioElement;
  scope.wrappers.Audio = Audio;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var rewrap = scope.rewrap;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;

  var OriginalHTMLOptionElement = window.HTMLOptionElement;

  function trimText(s) {
    return s.replace(/\s+/g, ' ').trim();
  }

  function HTMLOptionElement(node) {
    HTMLElement.call(this, node);
  }
  HTMLOptionElement.prototype = Object.create(HTMLElement.prototype);
  mixin(HTMLOptionElement.prototype, {
    get text() {
      return trimText(this.textContent);
    },
    set text(value) {
      this.textContent = trimText(String(value));
    },
    get form() {
      return wrap(unwrap(this).form);
    }
  });

  registerWrapper(OriginalHTMLOptionElement, HTMLOptionElement,
                  document.createElement('option'));

  function Option(text, value, defaultSelected, selected) {
    if (!(this instanceof Option)) {
      throw new TypeError(
          'DOM object constructor cannot be called as a function.');
    }

    var node = unwrap(document.createElement('option'));
    HTMLElement.call(this, node);
    rewrap(node, this);

    if (text !== undefined)
      node.text = text;
    if (value !== undefined)
      node.setAttribute('value', value);
    if (defaultSelected === true)
      node.setAttribute('selected', '');
    node.selected = selected === true;
  }

  Option.prototype = HTMLOptionElement.prototype;

  scope.wrappers.HTMLOptionElement = HTMLOptionElement;
  scope.wrappers.Option = Option;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLContentElement = scope.wrappers.HTMLContentElement;
  var HTMLElement = scope.wrappers.HTMLElement;
  var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
  var HTMLTemplateElement = scope.wrappers.HTMLTemplateElement;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;

  var OriginalHTMLUnknownElement = window.HTMLUnknownElement;

  function HTMLUnknownElement(node) {
    switch (node.localName) {
      case 'content':
        return new HTMLContentElement(node);
      case 'shadow':
        return new HTMLShadowElement(node);
      case 'template':
        return new HTMLTemplateElement(node);
    }
    HTMLElement.call(this, node);
  }
  HTMLUnknownElement.prototype = Object.create(HTMLElement.prototype);
  registerWrapper(OriginalHTMLUnknownElement, HTMLUnknownElement);
  scope.wrappers.HTMLUnknownElement = HTMLUnknownElement;
})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var unwrapIfNeeded = scope.unwrapIfNeeded;
  var wrap = scope.wrap;

  var OriginalCanvasRenderingContext2D = window.CanvasRenderingContext2D;

  function CanvasRenderingContext2D(impl) {
    this.impl = impl;
  }

  mixin(CanvasRenderingContext2D.prototype, {
    get canvas() {
      return wrap(this.impl.canvas);
    },

    drawImage: function() {
      arguments[0] = unwrapIfNeeded(arguments[0]);
      this.impl.drawImage.apply(this.impl, arguments);
    },

    createPattern: function() {
      arguments[0] = unwrap(arguments[0]);
      return this.impl.createPattern.apply(this.impl, arguments);
    }
  });

  registerWrapper(OriginalCanvasRenderingContext2D, CanvasRenderingContext2D);

  scope.wrappers.CanvasRenderingContext2D = CanvasRenderingContext2D;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrapIfNeeded = scope.unwrapIfNeeded;
  var wrap = scope.wrap;

  var OriginalWebGLRenderingContext = window.WebGLRenderingContext;

  // IE10 does not have WebGL.
  if (!OriginalWebGLRenderingContext)
    return;

  function WebGLRenderingContext(impl) {
    this.impl = impl;
  }

  mixin(WebGLRenderingContext.prototype, {
    get canvas() {
      return wrap(this.impl.canvas);
    },

    texImage2D: function() {
      arguments[5] = unwrapIfNeeded(arguments[5]);
      this.impl.texImage2D.apply(this.impl, arguments);
    },

    texSubImage2D: function() {
      arguments[6] = unwrapIfNeeded(arguments[6]);
      this.impl.texSubImage2D.apply(this.impl, arguments);
    }
  });

  registerWrapper(OriginalWebGLRenderingContext, WebGLRenderingContext);

  scope.wrappers.WebGLRenderingContext = WebGLRenderingContext;
})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var GetElementsByInterface = scope.GetElementsByInterface;
  var ParentNodeInterface = scope.ParentNodeInterface;
  var SelectorsInterface = scope.SelectorsInterface;
  var mixin = scope.mixin;
  var registerObject = scope.registerObject;

  var DocumentFragment = registerObject(document.createDocumentFragment());
  mixin(DocumentFragment.prototype, ParentNodeInterface);
  mixin(DocumentFragment.prototype, SelectorsInterface);
  mixin(DocumentFragment.prototype, GetElementsByInterface);

  var Text = registerObject(document.createTextNode(''));
  var Comment = registerObject(document.createComment(''));

  scope.wrappers.Comment = Comment;
  scope.wrappers.DocumentFragment = DocumentFragment;
  scope.wrappers.Text = Text;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var DocumentFragment = scope.wrappers.DocumentFragment;
  var elementFromPoint = scope.elementFromPoint;
  var getInnerHTML = scope.getInnerHTML;
  var mixin = scope.mixin;
  var rewrap = scope.rewrap;
  var setInnerHTML = scope.setInnerHTML;
  var unwrap = scope.unwrap;

  var shadowHostTable = new WeakMap();
  var nextOlderShadowTreeTable = new WeakMap();

  function ShadowRoot(hostWrapper) {
    var node = unwrap(hostWrapper.impl.ownerDocument.createDocumentFragment());
    DocumentFragment.call(this, node);

    // createDocumentFragment associates the node with a wrapper
    // DocumentFragment instance. Override that.
    rewrap(node, this);

    var oldShadowRoot = hostWrapper.shadowRoot;
    nextOlderShadowTreeTable.set(this, oldShadowRoot);

    shadowHostTable.set(this, hostWrapper);
  }
  ShadowRoot.prototype = Object.create(DocumentFragment.prototype);
  mixin(ShadowRoot.prototype, {
    get innerHTML() {
      return getInnerHTML(this);
    },
    set innerHTML(value) {
      setInnerHTML(this, value);
      this.invalidateShadowRenderer();
    },

    get olderShadowRoot() {
      return nextOlderShadowTreeTable.get(this) || null;
    },

    get host() {
      return shadowHostTable.get(this) || null;
    },

    invalidateShadowRenderer: function() {
      return shadowHostTable.get(this).invalidateShadowRenderer();
    },

    elementFromPoint: function(x, y) {
      return elementFromPoint(this, this.ownerDocument, x, y);
    },

    getElementById: function(id) {
      return this.querySelector('#' + id);
    }
  });

  scope.wrappers.ShadowRoot = ShadowRoot;
})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var Element = scope.wrappers.Element;
  var HTMLContentElement = scope.wrappers.HTMLContentElement;
  var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
  var Node = scope.wrappers.Node;
  var ShadowRoot = scope.wrappers.ShadowRoot;
  var assert = scope.assert;
  var mixin = scope.mixin;
  var muteMutationEvents = scope.muteMutationEvents;
  var oneOf = scope.oneOf;
  var unmuteMutationEvents = scope.unmuteMutationEvents;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;

  /**
   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
   * Up means parentNode
   * Sideways means previous and next sibling.
   * @param {!Node} wrapper
   */
  function updateWrapperUpAndSideways(wrapper) {
    wrapper.previousSibling_ = wrapper.previousSibling;
    wrapper.nextSibling_ = wrapper.nextSibling;
    wrapper.parentNode_ = wrapper.parentNode;
  }

  /**
   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
   * Down means first and last child
   * @param {!Node} wrapper
   */
  function updateWrapperDown(wrapper) {
    wrapper.firstChild_ = wrapper.firstChild;
    wrapper.lastChild_ = wrapper.lastChild;
  }

  function updateAllChildNodes(parentNodeWrapper) {
    assert(parentNodeWrapper instanceof Node);
    for (var childWrapper = parentNodeWrapper.firstChild;
         childWrapper;
         childWrapper = childWrapper.nextSibling) {
      updateWrapperUpAndSideways(childWrapper);
    }
    updateWrapperDown(parentNodeWrapper);
  }

  function insertBefore(parentNodeWrapper, newChildWrapper, refChildWrapper) {
    var parentNode = unwrap(parentNodeWrapper);
    var newChild = unwrap(newChildWrapper);
    var refChild = refChildWrapper ? unwrap(refChildWrapper) : null;

    remove(newChildWrapper);
    updateWrapperUpAndSideways(newChildWrapper);

    if (!refChildWrapper) {
      parentNodeWrapper.lastChild_ = parentNodeWrapper.lastChild;
      if (parentNodeWrapper.lastChild === parentNodeWrapper.firstChild)
        parentNodeWrapper.firstChild_ = parentNodeWrapper.firstChild;

      var lastChildWrapper = wrap(parentNode.lastChild);
      if (lastChildWrapper)
        lastChildWrapper.nextSibling_ = lastChildWrapper.nextSibling;
    } else {
      if (parentNodeWrapper.firstChild === refChildWrapper)
        parentNodeWrapper.firstChild_ = refChildWrapper;

      refChildWrapper.previousSibling_ = refChildWrapper.previousSibling;
    }

    parentNode.insertBefore(newChild, refChild);
  }

  function remove(nodeWrapper) {
    var node = unwrap(nodeWrapper)
    var parentNode = node.parentNode;
    if (!parentNode)
      return;

    var parentNodeWrapper = wrap(parentNode);
    updateWrapperUpAndSideways(nodeWrapper);

    if (nodeWrapper.previousSibling)
      nodeWrapper.previousSibling.nextSibling_ = nodeWrapper;
    if (nodeWrapper.nextSibling)
      nodeWrapper.nextSibling.previousSibling_ = nodeWrapper;

    if (parentNodeWrapper.lastChild === nodeWrapper)
      parentNodeWrapper.lastChild_ = nodeWrapper;
    if (parentNodeWrapper.firstChild === nodeWrapper)
      parentNodeWrapper.firstChild_ = nodeWrapper;

    parentNode.removeChild(node);
  }

  var distributedChildNodesTable = new WeakMap();
  var eventParentsTable = new WeakMap();
  var insertionParentTable = new WeakMap();
  var rendererForHostTable = new WeakMap();

  function distributeChildToInsertionPoint(child, insertionPoint) {
    getDistributedChildNodes(insertionPoint).push(child);
    assignToInsertionPoint(child, insertionPoint);

    var eventParents = eventParentsTable.get(child);
    if (!eventParents)
      eventParentsTable.set(child, eventParents = []);
    eventParents.push(insertionPoint);
  }

  function resetDistributedChildNodes(insertionPoint) {
    distributedChildNodesTable.set(insertionPoint, []);
  }

  function getDistributedChildNodes(insertionPoint) {
    return distributedChildNodesTable.get(insertionPoint);
  }

  function getChildNodesSnapshot(node) {
    var result = [], i = 0;
    for (var child = node.firstChild; child; child = child.nextSibling) {
      result[i++] = child;
    }
    return result;
  }

  /**
   * Visits all nodes in the tree that fulfils the |predicate|. If the |visitor|
   * function returns |false| the traversal is aborted.
   * @param {!Node} tree
   * @param {function(!Node) : boolean} predicate
   * @param {function(!Node) : *} visitor
   */
  function visit(tree, predicate, visitor) {
    // This operates on logical DOM.
    for (var node = tree.firstChild; node; node = node.nextSibling) {
      if (predicate(node)) {
        if (visitor(node) === false)
          return;
      } else {
        visit(node, predicate, visitor);
      }
    }
  }

  // Matching Insertion Points
  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#matching-insertion-points

  // TODO(arv): Verify this... I don't remember why I picked this regexp.
  var selectorMatchRegExp = /^[*.:#[a-zA-Z_|]/;

  var allowedPseudoRegExp = new RegExp('^:(' + [
    'link',
    'visited',
    'target',
    'enabled',
    'disabled',
    'checked',
    'indeterminate',
    'nth-child',
    'nth-last-child',
    'nth-of-type',
    'nth-last-of-type',
    'first-child',
    'last-child',
    'first-of-type',
    'last-of-type',
    'only-of-type',
  ].join('|') + ')');


  /**
   * @param {Element} node
   * @oaram {Element} point The insertion point element.
   * @return {boolean} Whether the node matches the insertion point.
   */
  function matchesCriteria(node, point) {
    var select = point.getAttribute('select');
    if (!select)
      return true;

    // Here we know the select attribute is a non empty string.
    select = select.trim();
    if (!select)
      return true;

    if (!(node instanceof Element))
      return false;

    // TODO(arv): This does not seem right. Need to check for a simple selector.
    if (!selectorMatchRegExp.test(select))
      return false;

    if (select[0] === ':' && !allowedPseudoRegExp.test(select))
      return false;

    try {
      return node.matches(select);
    } catch (ex) {
      // Invalid selector.
      return false;
    }
  }

  var request = oneOf(window, [
    'requestAnimationFrame',
    'mozRequestAnimationFrame',
    'webkitRequestAnimationFrame',
    'setTimeout'
  ]);

  var pendingDirtyRenderers = [];
  var renderTimer;

  function renderAllPending() {
    for (var i = 0; i < pendingDirtyRenderers.length; i++) {
      pendingDirtyRenderers[i].render();
    }
    pendingDirtyRenderers = [];
  }

  function handleRequestAnimationFrame() {
    renderTimer = null;
    renderAllPending();
  }

  /**
   * Returns existing shadow renderer for a host or creates it if it is needed.
   * @params {!Element} host
   * @return {!ShadowRenderer}
   */
  function getRendererForHost(host) {
    var renderer = rendererForHostTable.get(host);
    if (!renderer) {
      renderer = new ShadowRenderer(host);
      rendererForHostTable.set(host, renderer);
    }
    return renderer;
  }

  function getShadowRootAncestor(node) {
    for (; node; node = node.parentNode) {
      if (node instanceof ShadowRoot)
        return node;
    }
    return null;
  }

  function getRendererForShadowRoot(shadowRoot) {
    return getRendererForHost(shadowRoot.host);
  }

  var spliceDiff = new ArraySplice();
  spliceDiff.equals = function(renderNode, rawNode) {
    return unwrap(renderNode.node) === rawNode;
  };

  /**
   * RenderNode is used as an in memory "render tree". When we render the
   * composed tree we create a tree of RenderNodes, then we diff this against
   * the real DOM tree and make minimal changes as needed.
   */
  function RenderNode(node) {
    this.skip = false;
    this.node = node;
    this.childNodes = [];
  }

  RenderNode.prototype = {
    append: function(node) {
      var rv = new RenderNode(node);
      this.childNodes.push(rv);
      return rv;
    },

    sync: function(opt_added) {
      if (this.skip)
        return;

      var nodeWrapper = this.node;
      // plain array of RenderNodes
      var newChildren = this.childNodes;
      // plain array of real nodes.
      var oldChildren = getChildNodesSnapshot(unwrap(nodeWrapper));
      var added = opt_added || new WeakMap();

      var splices = spliceDiff.calculateSplices(newChildren, oldChildren);

      var newIndex = 0, oldIndex = 0;
      var lastIndex = 0;
      for (var i = 0; i < splices.length; i++) {
        var splice = splices[i];
        for (; lastIndex < splice.index; lastIndex++) {
          oldIndex++;
          newChildren[newIndex++].sync(added);
        }

        var removedCount = splice.removed.length;
        for (var j = 0; j < removedCount; j++) {
          var wrapper = wrap(oldChildren[oldIndex++]);
          if (!added.get(wrapper))
            remove(wrapper);
        }

        var addedCount = splice.addedCount;
        var refNode = oldChildren[oldIndex] && wrap(oldChildren[oldIndex]);
        for (var j = 0; j < addedCount; j++) {
          var newChildRenderNode = newChildren[newIndex++];
          var newChildWrapper = newChildRenderNode.node;
          insertBefore(nodeWrapper, newChildWrapper, refNode);

          // Keep track of added so that we do not remove the node after it
          // has been added.
          added.set(newChildWrapper, true);

          newChildRenderNode.sync(added);
        }

        lastIndex += addedCount;
      }

      for (var i = lastIndex; i < newChildren.length; i++) {
        newChildren[i].sync(added);
      }
    }
  };

  function ShadowRenderer(host) {
    this.host = host;
    this.dirty = false;
    this.invalidateAttributes();
    this.associateNode(host);
  }

  ShadowRenderer.prototype = {

    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#rendering-shadow-trees
    render: function(opt_renderNode) {
      if (!this.dirty)
        return;

      this.invalidateAttributes();
      this.treeComposition();

      var host = this.host;
      var shadowRoot = host.shadowRoot;

      this.associateNode(host);
      var topMostRenderer = !renderNode;
      var renderNode = opt_renderNode || new RenderNode(host);

      for (var node = shadowRoot.firstChild; node; node = node.nextSibling) {
        this.renderNode(shadowRoot, renderNode, node, false);
      }

      if (topMostRenderer) {
        //muteMutationEvents();
        renderNode.sync();
        //unmuteMutationEvents();
      }

      this.dirty = false;
    },

    invalidate: function() {
      if (!this.dirty) {
        this.dirty = true;
        pendingDirtyRenderers.push(this);
        if (renderTimer)
          return;
        renderTimer = window[request](handleRequestAnimationFrame, 0);
      }
    },

    renderNode: function(shadowRoot, renderNode, node, isNested) {
      if (isShadowHost(node)) {
        renderNode = renderNode.append(node);
        var renderer = getRendererForHost(node);
        renderer.dirty = true;  // Need to rerender due to reprojection.
        renderer.render(renderNode);
      } else if (isInsertionPoint(node)) {
        this.renderInsertionPoint(shadowRoot, renderNode, node, isNested);
      } else if (isShadowInsertionPoint(node)) {
        this.renderShadowInsertionPoint(shadowRoot, renderNode, node);
      } else {
        this.renderAsAnyDomTree(shadowRoot, renderNode, node, isNested);
      }
    },

    renderAsAnyDomTree: function(shadowRoot, renderNode, node, isNested) {
      renderNode = renderNode.append(node);

      if (isShadowHost(node)) {
        var renderer = getRendererForHost(node);
        renderNode.skip = !renderer.dirty;
        renderer.render(renderNode);
      } else {
        for (var child = node.firstChild; child; child = child.nextSibling) {
          this.renderNode(shadowRoot, renderNode, child, isNested);
        }
      }
    },

    renderInsertionPoint: function(shadowRoot, renderNode, insertionPoint,
                                   isNested) {
      var distributedChildNodes = getDistributedChildNodes(insertionPoint);
      if (distributedChildNodes.length) {
        this.associateNode(insertionPoint);

        for (var i = 0; i < distributedChildNodes.length; i++) {
          var child = distributedChildNodes[i];
          if (isInsertionPoint(child) && isNested)
            this.renderInsertionPoint(shadowRoot, renderNode, child, isNested);
          else
            this.renderAsAnyDomTree(shadowRoot, renderNode, child, isNested);
        }
      } else {
        this.renderFallbackContent(shadowRoot, renderNode, insertionPoint);
      }
      this.associateNode(insertionPoint.parentNode);
    },

    renderShadowInsertionPoint: function(shadowRoot, renderNode,
                                         shadowInsertionPoint) {
      var nextOlderTree = shadowRoot.olderShadowRoot;
      if (nextOlderTree) {
        assignToInsertionPoint(nextOlderTree, shadowInsertionPoint);
        this.associateNode(shadowInsertionPoint.parentNode);
        for (var node = nextOlderTree.firstChild;
             node;
             node = node.nextSibling) {
          this.renderNode(nextOlderTree, renderNode, node, true);
        }
      } else {
        this.renderFallbackContent(shadowRoot, renderNode,
                                   shadowInsertionPoint);
      }
    },

    renderFallbackContent: function(shadowRoot, renderNode, fallbackHost) {
      this.associateNode(fallbackHost);
      this.associateNode(fallbackHost.parentNode);
      for (var node = fallbackHost.firstChild; node; node = node.nextSibling) {
        this.renderAsAnyDomTree(shadowRoot, renderNode, node, false);
      }
    },

    /**
     * Invalidates the attributes used to keep track of which attributes may
     * cause the renderer to be invalidated.
     */
    invalidateAttributes: function() {
      this.attributes = Object.create(null);
    },

    /**
     * Parses the selector and makes this renderer dependent on the attribute
     * being used in the selector.
     * @param {string} selector
     */
    updateDependentAttributes: function(selector) {
      if (!selector)
        return;

      var attributes = this.attributes;

      // .class
      if (/\.\w+/.test(selector))
        attributes['class'] = true;

      // #id
      if (/#\w+/.test(selector))
        attributes['id'] = true;

      selector.replace(/\[\s*([^\s=\|~\]]+)/g, function(_, name) {
        attributes[name] = true;
      });

      // Pseudo selectors have been removed from the spec.
    },

    dependsOnAttribute: function(name) {
      return this.attributes[name];
    },

    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-distribution-algorithm
    distribute: function(tree, pool) {
      var self = this;

      visit(tree, isActiveInsertionPoint,
          function(insertionPoint) {
            resetDistributedChildNodes(insertionPoint);
            self.updateDependentAttributes(
                insertionPoint.getAttribute('select'));

            for (var i = 0; i < pool.length; i++) {  // 1.2
              var node = pool[i];  // 1.2.1
              if (node === undefined)  // removed
                continue;
              if (matchesCriteria(node, insertionPoint)) {  // 1.2.2
                distributeChildToInsertionPoint(node, insertionPoint);  // 1.2.2.1
                pool[i] = undefined;  // 1.2.2.2
              }
            }
          });
    },

    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-tree-composition
    treeComposition: function () {
      var shadowHost = this.host;
      var tree = shadowHost.shadowRoot;  // 1.
      var pool = [];  // 2.

      for (var child = shadowHost.firstChild;
           child;
           child = child.nextSibling) {  // 3.
        if (isInsertionPoint(child)) {  // 3.2.
          var reprojected = getDistributedChildNodes(child);  // 3.2.1.
          // if reprojected is undef... reset it?
          if (!reprojected || !reprojected.length)  // 3.2.2.
            reprojected = getChildNodesSnapshot(child);
          pool.push.apply(pool, reprojected);  // 3.2.3.
        } else {
          pool.push(child); // 3.3.
        }
      }

      var shadowInsertionPoint, point;
      while (tree) {  // 4.
        // 4.1.
        shadowInsertionPoint = undefined;  // Reset every iteration.
        visit(tree, isActiveShadowInsertionPoint, function(point) {
          shadowInsertionPoint = point;
          return false;
        });
        point = shadowInsertionPoint;

        this.distribute(tree, pool);  // 4.2.
        if (point) {  // 4.3.
          var nextOlderTree = tree.olderShadowRoot;  // 4.3.1.
          if (!nextOlderTree) {
            break;  // 4.3.1.1.
          } else {
            tree = nextOlderTree;  // 4.3.2.2.
            assignToInsertionPoint(tree, point);  // 4.3.2.2.
            continue;  // 4.3.2.3.
          }
        } else {
          break;  // 4.4.
        }
      }
    },

    associateNode: function(node) {
      node.impl.polymerShadowRenderer_ = this;
    }
  };

  function isInsertionPoint(node) {
    // Should this include <shadow>?
    return node instanceof HTMLContentElement;
  }

  function isActiveInsertionPoint(node) {
    // <content> inside another <content> or <shadow> is considered inactive.
    return node instanceof HTMLContentElement;
  }

  function isShadowInsertionPoint(node) {
    return node instanceof HTMLShadowElement;
  }

  function isActiveShadowInsertionPoint(node) {
    // <shadow> inside another <content> or <shadow> is considered inactive.
    return node instanceof HTMLShadowElement;
  }

  function isShadowHost(shadowHost) {
    return shadowHost.shadowRoot;
  }

  function getShadowTrees(host) {
    var trees = [];

    for (var tree = host.shadowRoot; tree; tree = tree.olderShadowRoot) {
      trees.push(tree);
    }
    return trees;
  }

  function assignToInsertionPoint(tree, point) {
    insertionParentTable.set(tree, point);
  }

  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#rendering-shadow-trees
  function render(host) {
    new ShadowRenderer(host).render();
  };

  // Need to rerender shadow host when:
  //
  // - a direct child to the ShadowRoot is added or removed
  // - a direct child to the host is added or removed
  // - a new shadow root is created
  // - a direct child to a content/shadow element is added or removed
  // - a sibling to a content/shadow element is added or removed
  // - content[select] is changed
  // - an attribute in a direct child to a host is modified

  /**
   * This gets called when a node was added or removed to it.
   */
  Node.prototype.invalidateShadowRenderer = function(force) {
    var renderer = this.impl.polymerShadowRenderer_;
    if (renderer) {
      renderer.invalidate();
      return true;
    }

    return false;
  };

  HTMLContentElement.prototype.getDistributedNodes = function() {
    // TODO(arv): We should only rerender the dirty ancestor renderers (from
    // the root and down).
    renderAllPending();
    return getDistributedChildNodes(this);
  };

  HTMLShadowElement.prototype.nodeWasAdded_ =
  HTMLContentElement.prototype.nodeWasAdded_ = function() {
    // Invalidate old renderer if any.
    this.invalidateShadowRenderer();

    var shadowRoot = getShadowRootAncestor(this);
    var renderer;
    if (shadowRoot)
      renderer = getRendererForShadowRoot(shadowRoot);
    this.impl.polymerShadowRenderer_ = renderer;
    if (renderer)
      renderer.invalidate();
  };

  scope.eventParentsTable = eventParentsTable;
  scope.getRendererForHost = getRendererForHost;
  scope.getShadowTrees = getShadowTrees;
  scope.insertionParentTable = insertionParentTable;
  scope.renderAllPending = renderAllPending;

  // Exposed for testing
  scope.visual = {
    insertBefore: insertBefore,
    remove: remove,
  };

})(this.ShadowDOMPolyfill);
// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var HTMLElement = scope.wrappers.HTMLElement;
  var assert = scope.assert;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;

  var elementsWithFormProperty = [
    'HTMLButtonElement',
    'HTMLFieldSetElement',
    'HTMLInputElement',
    'HTMLKeygenElement',
    'HTMLLabelElement',
    'HTMLLegendElement',
    'HTMLObjectElement',
    // HTMLOptionElement is handled in HTMLOptionElement.js
    'HTMLOutputElement',
    'HTMLSelectElement',
    'HTMLTextAreaElement',
  ];

  function createWrapperConstructor(name) {
    if (!window[name])
      return;

    // Ensure we are not overriding an already existing constructor.
    assert(!scope.wrappers[name]);

    var GeneratedWrapper = function(node) {
      // At this point all of them extend HTMLElement.
      HTMLElement.call(this, node);
    }
    GeneratedWrapper.prototype = Object.create(HTMLElement.prototype);
    mixin(GeneratedWrapper.prototype, {
      get form() {
        return wrap(unwrap(this).form);
      },
    });

    registerWrapper(window[name], GeneratedWrapper,
        document.createElement(name.slice(4, -7)));
    scope.wrappers[name] = GeneratedWrapper;
  }

  elementsWithFormProperty.forEach(createWrapperConstructor);

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var GetElementsByInterface = scope.GetElementsByInterface;
  var Node = scope.wrappers.Node;
  var ParentNodeInterface = scope.ParentNodeInterface;
  var SelectorsInterface = scope.SelectorsInterface;
  var ShadowRoot = scope.wrappers.ShadowRoot;
  var defineWrapGetter = scope.defineWrapGetter;
  var elementFromPoint = scope.elementFromPoint;
  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
  var matchesName = scope.matchesName;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var wrap = scope.wrap;
  var wrapEventTargetMethods = scope.wrapEventTargetMethods;
  var wrapNodeList = scope.wrapNodeList;

  var implementationTable = new WeakMap();

  function Document(node) {
    Node.call(this, node);
  }
  Document.prototype = Object.create(Node.prototype);

  defineWrapGetter(Document, 'documentElement');

  // Conceptually both body and head can be in a shadow but suporting that seems
  // overkill at this point.
  defineWrapGetter(Document, 'body');
  defineWrapGetter(Document, 'head');

  // document cannot be overridden so we override a bunch of its methods
  // directly on the instance.

  function wrapMethod(name) {
    var original = document[name];
    Document.prototype[name] = function() {
      return wrap(original.apply(this.impl, arguments));
    };
  }

  [
    'createComment',
    'createDocumentFragment',
    'createElement',
    'createElementNS',
    'createEvent',
    'createEventNS',
    'createRange',
    'createTextNode',
    'getElementById',
  ].forEach(wrapMethod);

  var originalAdoptNode = document.adoptNode;

  function adoptNodeNoRemove(node, doc) {
    originalAdoptNode.call(doc.impl, unwrap(node));
    adoptSubtree(node, doc);
  }

  function adoptSubtree(node, doc) {
    if (node.shadowRoot)
      doc.adoptNode(node.shadowRoot);
    if (node instanceof ShadowRoot)
      adoptOlderShadowRoots(node, doc);
    for (var child = node.firstChild; child; child = child.nextSibling) {
      adoptSubtree(child, doc);
    }
  }

  function adoptOlderShadowRoots(shadowRoot, doc) {
    var oldShadowRoot = shadowRoot.olderShadowRoot;
    if (oldShadowRoot)
      doc.adoptNode(oldShadowRoot);
  }

  mixin(Document.prototype, {
    adoptNode: function(node) {
      if (node.parentNode)
        node.parentNode.removeChild(node);
      adoptNodeNoRemove(node, this);
      return node;
    },
    elementFromPoint: function(x, y) {
      return elementFromPoint(this, this, x, y);
    }
  });

  if (document.register) {
    var originalRegister = document.register;
    Document.prototype.register = function(tagName, object) {
      var prototype = object.prototype;

      // If we already used the object as a prototype for another custom
      // element.
      if (scope.nativePrototypeTable.get(prototype)) {
        // TODO(arv): DOMException
        throw new Error('NotSupportedError');
      }

      // Find first object on the prototype chain that already have a native
      // prototype. Keep track of all the objects before that so we can create
      // a similar structure for the native case.
      var proto = Object.getPrototypeOf(prototype);
      var nativePrototype;
      var prototypes = [];
      while (proto) {
        nativePrototype = scope.nativePrototypeTable.get(proto);
        if (nativePrototype)
          break;
        prototypes.push(proto);
        proto = Object.getPrototypeOf(proto);
      }

      if (!nativePrototype) {
        // TODO(arv): DOMException
        throw new Error('NotSupportedError');
      }

      // This works by creating a new prototype object that is empty, but has
      // the native prototype as its proto. The original prototype object
      // passed into register is used as the wrapper prototype.

      var newPrototype = Object.create(nativePrototype);
      for (var i = prototypes.length - 1; i >= 0; i--) {
        newPrototype = Object.create(newPrototype);
      }

      // Add callbacks if present.
      // Names are taken from:
      //   https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/v8/CustomElementConstructorBuilder.cpp&sq=package:chromium&type=cs&l=156
      // and not from the spec since the spec is out of date.
      [
        'createdCallback',
        'enteredViewCallback',
        'leftViewCallback',
        'attributeChangedCallback',
      ].forEach(function(name) {
        var f = prototype[name];
        if (!f)
          return;
        newPrototype[name] = function() {
          f.apply(wrap(this), arguments);
        };
      });

      var p = {prototype: newPrototype};
      if (object.extends)
        p.extends = object.extends;
      var nativeConstructor = originalRegister.call(unwrap(this), tagName, p);

      function GeneratedWrapper(node) {
        if (!node) {
          if (object.extends) {
            return document.createElement(object.extends, tagName);
          } else {
            return document.createElement(tagName);
          }
        }
        this.impl = node;
      }
      GeneratedWrapper.prototype = prototype;
      GeneratedWrapper.prototype.constructor = GeneratedWrapper;

      scope.constructorTable.set(newPrototype, GeneratedWrapper);
      scope.nativePrototypeTable.set(prototype, newPrototype);

      return GeneratedWrapper;
    };

    forwardMethodsToWrapper([
      window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
    ], [
      'register',
    ]);
  }

  // We also override some of the methods on document.body and document.head
  // for convenience.
  forwardMethodsToWrapper([
    window.HTMLBodyElement,
    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
    window.HTMLHeadElement,
    window.HTMLHtmlElement,
  ], [
    'appendChild',
    'compareDocumentPosition',
    'contains',
    'getElementsByClassName',
    'getElementsByTagName',
    'getElementsByTagNameNS',
    'insertBefore',
    'querySelector',
    'querySelectorAll',
    'removeChild',
    'replaceChild',
    matchesName,
  ]);

  forwardMethodsToWrapper([
    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
  ], [
    'adoptNode',
    'contains',
    'createComment',
    'createDocumentFragment',
    'createElement',
    'createElementNS',
    'createEvent',
    'createEventNS',
    'createRange',
    'createTextNode',
    'elementFromPoint',
    'getElementById',
  ]);

  mixin(Document.prototype, GetElementsByInterface);
  mixin(Document.prototype, ParentNodeInterface);
  mixin(Document.prototype, SelectorsInterface);

  mixin(Document.prototype, {
    get implementation() {
      var implementation = implementationTable.get(this);
      if (implementation)
        return implementation;
      implementation =
          new DOMImplementation(unwrap(this).implementation);
      implementationTable.set(this, implementation);
      return implementation;
    }
  });

  registerWrapper(window.Document, Document,
      document.implementation.createHTMLDocument(''));

  // Both WebKit and Gecko uses HTMLDocument for document. HTML5/DOM only has
  // one Document interface and IE implements the standard correctly.
  if (window.HTMLDocument)
    registerWrapper(window.HTMLDocument, Document);

  wrapEventTargetMethods([
    window.HTMLBodyElement,
    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
    window.HTMLHeadElement,
  ]);

  function DOMImplementation(impl) {
    this.impl = impl;
  }

  function wrapImplMethod(constructor, name) {
    var original = document.implementation[name];
    constructor.prototype[name] = function() {
      return wrap(original.apply(this.impl, arguments));
    };
  }

  function forwardImplMethod(constructor, name) {
    var original = document.implementation[name];
    constructor.prototype[name] = function() {
      return original.apply(this.impl, arguments);
    };
  }

  wrapImplMethod(DOMImplementation, 'createDocumentType');
  wrapImplMethod(DOMImplementation, 'createDocument');
  wrapImplMethod(DOMImplementation, 'createHTMLDocument');
  forwardImplMethod(DOMImplementation, 'hasFeature');

  registerWrapper(window.DOMImplementation, DOMImplementation);

  forwardMethodsToWrapper([
    window.DOMImplementation,
  ], [
    'createDocumentType',
    'createDocument',
    'createHTMLDocument',
    'hasFeature',
  ]);

  scope.adoptNodeNoRemove = adoptNodeNoRemove;
  scope.wrappers.DOMImplementation = DOMImplementation;
  scope.wrappers.Document = Document;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var EventTarget = scope.wrappers.EventTarget;
  var mixin = scope.mixin;
  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var unwrapIfNeeded = scope.unwrapIfNeeded;
  var wrap = scope.wrap;
  var renderAllPending = scope.renderAllPending;

  var OriginalWindow = window.Window;

  function Window(impl) {
    EventTarget.call(this, impl);
  }
  Window.prototype = Object.create(EventTarget.prototype);

  var originalGetComputedStyle = window.getComputedStyle;
  OriginalWindow.prototype.getComputedStyle = function(el, pseudo) {
    renderAllPending();
    return originalGetComputedStyle.call(this || window, unwrapIfNeeded(el),
                                         pseudo);
  };

  ['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach(
      function(name) {
        OriginalWindow.prototype[name] = function() {
          var w = wrap(this || window);
          return w[name].apply(w, arguments);
        };
      });

  mixin(Window.prototype, {
    getComputedStyle: function(el, pseudo) {
      return originalGetComputedStyle.call(unwrap(this), unwrapIfNeeded(el),
                                           pseudo);
    }
  });

  registerWrapper(OriginalWindow, Window);

  scope.wrappers.Window = Window;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var defineGetter = scope.defineGetter;
  var defineWrapGetter = scope.defineWrapGetter;
  var registerWrapper = scope.registerWrapper;
  var unwrapIfNeeded = scope.unwrapIfNeeded;
  var wrapNodeList = scope.wrapNodeList;
  var wrappers = scope.wrappers;

  var OriginalMutationObserver = window.MutationObserver ||
      window.WebKitMutationObserver;

  if (!OriginalMutationObserver)
    return;

  var OriginalMutationRecord = window.MutationRecord;

  function MutationRecord(impl) {
    this.impl = impl;
  }

  MutationRecord.prototype = {
    get addedNodes() {
      return wrapNodeList(this.impl.addedNodes);
    },
    get removedNodes() {
      return wrapNodeList(this.impl.removedNodes);
    }
  };

  ['target', 'previousSibling', 'nextSibling'].forEach(function(name) {
    defineWrapGetter(MutationRecord, name);
  });

  // WebKit/Blink treats these as instance properties so we override
  [
    'type',
    'attributeName',
    'attributeNamespace',
    'oldValue'
  ].forEach(function(name) {
    defineGetter(MutationRecord, name, function() {
      return this.impl[name];
    });
  });

  if (OriginalMutationRecord)
    registerWrapper(OriginalMutationRecord, MutationRecord);

  function wrapRecord(record) {
    return new MutationRecord(record);
  }

  function wrapRecords(records) {
    return records.map(wrapRecord);
  }

  function MutationObserver(callback) {
    var self = this;
    this.impl = new OriginalMutationObserver(function(mutations, observer) {
      callback.call(self, wrapRecords(mutations), self);
    });
  }

  var OriginalNode = window.Node;

  MutationObserver.prototype = {
    observe: function(target, options) {
      this.impl.observe(unwrapIfNeeded(target), options);
    },
    disconnect: function() {
      this.impl.disconnect();
    },
    takeRecords: function() {
      return wrapRecords(this.impl.takeRecords());
    }
  };

  scope.wrappers.MutationObserver = MutationObserver;
  scope.wrappers.MutationRecord = MutationRecord;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var registerWrapper = scope.registerWrapper;
  var unwrap = scope.unwrap;
  var unwrapIfNeeded = scope.unwrapIfNeeded;
  var wrap = scope.wrap;

  var OriginalRange = window.Range;

  function Range(impl) {
    this.impl = impl;
  }
  Range.prototype = {
    get startContainer() {
      return wrap(this.impl.startContainer);
    },
    get endContainer() {
      return wrap(this.impl.endContainer);
    },
    get commonAncestorContainer() {
      return wrap(this.impl.commonAncestorContainer);
    },
    setStart: function(refNode,offset) {
      this.impl.setStart(unwrapIfNeeded(refNode), offset);
    },
    setEnd: function(refNode,offset) {
      this.impl.setEnd(unwrapIfNeeded(refNode), offset);
    },
    setStartBefore: function(refNode) {
      this.impl.setStartBefore(unwrapIfNeeded(refNode));
    },
    setStartAfter: function(refNode) {
      this.impl.setStartAfter(unwrapIfNeeded(refNode));
    },
    setEndBefore: function(refNode) {
      this.impl.setEndBefore(unwrapIfNeeded(refNode));
    },
    setEndAfter: function(refNode) {
      this.impl.setEndAfter(unwrapIfNeeded(refNode));
    },
    selectNode: function(refNode) {
      this.impl.selectNode(unwrapIfNeeded(refNode));
    },
    selectNodeContents: function(refNode) {
      this.impl.selectNodeContents(unwrapIfNeeded(refNode));
    },
    compareBoundaryPoints: function(how, sourceRange) {
      return this.impl.compareBoundaryPoints(how, unwrap(sourceRange));
    },
    extractContents: function() {
      return wrap(this.impl.extractContents());
    },
    cloneContents: function() {
      return wrap(this.impl.cloneContents());
    },
    insertNode: function(node) {
      this.impl.insertNode(unwrapIfNeeded(node));
    },
    surroundContents: function(newParent) {
      this.impl.surroundContents(unwrapIfNeeded(newParent));
    },
    cloneRange: function() {
      return wrap(this.impl.cloneRange());
    },
    isPointInRange: function(node, offset) {
      return this.impl.isPointInRange(unwrapIfNeeded(node), offset);
    },
    comparePoint: function(node, offset) {
      return this.impl.comparePoint(unwrapIfNeeded(node), offset);
    },
    intersectsNode: function(node) {
      return this.impl.intersectsNode(unwrapIfNeeded(node));
    }
  };

  // IE9 does not have createContextualFragment.
  if (OriginalRange.prototype.createContextualFragment) {
    Range.prototype.createContextualFragment = function(html) {
      return wrap(this.impl.createContextualFragment(html));
    };
  }

  registerWrapper(window.Range, Range);

  scope.wrappers.Range = Range;

})(this.ShadowDOMPolyfill);

// Copyright 2013 The Polymer Authors. All rights reserved.
// Use of this source code is goverened by a BSD-style
// license that can be found in the LICENSE file.

(function(scope) {
  'use strict';

  var isWrapperFor = scope.isWrapperFor;

  // This is a list of the elements we currently override the global constructor
  // for.
  var elements = {
    'a': 'HTMLAnchorElement',
    'applet': 'HTMLAppletElement',
    'area': 'HTMLAreaElement',
    'br': 'HTMLBRElement',
    'base': 'HTMLBaseElement',
    'body': 'HTMLBodyElement',
    'button': 'HTMLButtonElement',
    // 'command': 'HTMLCommandElement',  // Not fully implemented in Gecko.
    'dl': 'HTMLDListElement',
    'datalist': 'HTMLDataListElement',
    'data': 'HTMLDataElement',
    'dir': 'HTMLDirectoryElement',
    'div': 'HTMLDivElement',
    'embed': 'HTMLEmbedElement',
    'fieldset': 'HTMLFieldSetElement',
    'font': 'HTMLFontElement',
    'form': 'HTMLFormElement',
    'frame': 'HTMLFrameElement',
    'frameset': 'HTMLFrameSetElement',
    'hr': 'HTMLHRElement',
    'head': 'HTMLHeadElement',
    'h1': 'HTMLHeadingElement',
    'html': 'HTMLHtmlElement',
    'iframe': 'HTMLIFrameElement',
    'input': 'HTMLInputElement',
    'li': 'HTMLLIElement',
    'label': 'HTMLLabelElement',
    'legend': 'HTMLLegendElement',
    'link': 'HTMLLinkElement',
    'map': 'HTMLMapElement',
    'marquee': 'HTMLMarqueeElement',
    'menu': 'HTMLMenuElement',
    'menuitem': 'HTMLMenuItemElement',
    'meta': 'HTMLMetaElement',
    'meter': 'HTMLMeterElement',
    'del': 'HTMLModElement',
    'ol': 'HTMLOListElement',
    'object': 'HTMLObjectElement',
    'optgroup': 'HTMLOptGroupElement',
    'option': 'HTMLOptionElement',
    'output': 'HTMLOutputElement',
    'p': 'HTMLParagraphElement',
    'param': 'HTMLParamElement',
    'pre': 'HTMLPreElement',
    'progress': 'HTMLProgressElement',
    'q': 'HTMLQuoteElement',
    'script': 'HTMLScriptElement',
    'select': 'HTMLSelectElement',
    'source': 'HTMLSourceElement',
    'span': 'HTMLSpanElement',
    'style': 'HTMLStyleElement',
    'time': 'HTMLTimeElement',
    'caption': 'HTMLTableCaptionElement',
    // WebKit and Moz are wrong:
    // https://bugs.webkit.org/show_bug.cgi?id=111469
    // https://bugzilla.mozilla.org/show_bug.cgi?id=848096
    // 'td': 'HTMLTableCellElement',
    'col': 'HTMLTableColElement',
    'table': 'HTMLTableElement',
    'tr': 'HTMLTableRowElement',
    'thead': 'HTMLTableSectionElement',
    'tbody': 'HTMLTableSectionElement',
    'textarea': 'HTMLTextAreaElement',
    'track': 'HTMLTrackElement',
    'title': 'HTMLTitleElement',
    'ul': 'HTMLUListElement',
    'video': 'HTMLVideoElement',
  };

  function overrideConstructor(tagName) {
    var nativeConstructorName = elements[tagName];
    var nativeConstructor = window[nativeConstructorName];
    if (!nativeConstructor)
      return;
    var element = document.createElement(tagName);
    var wrapperConstructor = element.constructor;
    window[nativeConstructorName] = wrapperConstructor;
  }

  Object.keys(elements).forEach(overrideConstructor);

  Object.getOwnPropertyNames(scope.wrappers).forEach(function(name) {
    window[name] = scope.wrappers[name]
  });

  // Export for testing.
  scope.knownElements = elements;

})(this.ShadowDOMPolyfill);
/*
 * Copyright 2013 The Polymer Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
(function() {
  var ShadowDOMPolyfill = window.ShadowDOMPolyfill;
  var wrap = ShadowDOMPolyfill.wrap;

  // patch in prefixed name
  Object.defineProperties(HTMLElement.prototype, {
    //TODO(sjmiles): review accessor alias with Arv
    webkitShadowRoot: {
      get: function() {
        return this.shadowRoot;
      }
    }
  });

  //TODO(sjmiles): review method alias with Arv
  HTMLElement.prototype.webkitCreateShadowRoot =
      HTMLElement.prototype.createShadowRoot;

  // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
  window.dartExperimentalFixupGetTag = function(originalGetTag) {
    var NodeList = ShadowDOMPolyfill.wrappers.NodeList;
    var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot;
    var unwrapIfNeeded = ShadowDOMPolyfill.unwrapIfNeeded;
    function getTag(obj) {
      // TODO(jmesserly): do we still need these?
      if (obj instanceof NodeList) return 'NodeList';
      if (obj instanceof ShadowRoot) return 'ShadowRoot';
      if (window.MutationRecord && (obj instanceof MutationRecord))
          return 'MutationRecord';
      if (window.MutationObserver && (obj instanceof MutationObserver))
          return 'MutationObserver';

      // TODO(jmesserly): this prevents incorrect interaction between ShadowDOM
      // and dart:html's <template> polyfill. Essentially, ShadowDOM is
      // polyfilling native template, but our Dart polyfill fails to detect this
      // because the unwrapped node is an HTMLUnknownElement, leading it to
      // think the node has no content.
      if (obj instanceof HTMLTemplateElement) return 'HTMLTemplateElement';

      var unwrapped = unwrapIfNeeded(obj);
      if (obj !== unwrapped) {
        // Fix up class names for Firefox.
        // For some of them (like HTMLFormElement and HTMLInputElement),
        // the "constructor" property of the unwrapped nodes points at the
        // same constructor as the wrapper.
        var ctor = obj.constructor
        if (ctor === unwrapped.constructor) {
          var name = ctor._ShadowDOMPolyfill$cacheTag_;
          if (!name) {
            name = Object.prototype.toString.call(unwrapped);
            name = name.substring(8, name.length - 1);
            ctor._ShadowDOMPolyfill$cacheTag_ = name;
          }
          return name;
        }

        obj = unwrapped;
      }
      return originalGetTag(obj);
    }

    return getTag;
  };
})();

// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

var Platform = {};

/*
 * Copyright 2012 The Polymer Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */

/*
  This is a limited shim for ShadowDOM css styling.
  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles
  
  The intention here is to support only the styling features which can be 
  relatively simply implemented. The goal is to allow users to avoid the 
  most obvious pitfalls and do so without compromising performance significantly. 
  For ShadowDOM styling that's not covered here, a set of best practices
  can be provided that should allow users to accomplish more complex styling.

  The following is a list of specific ShadowDOM styling features and a brief
  discussion of the approach used to shim.

  Shimmed features:

  * @host: ShadowDOM allows styling of the shadowRoot's host element using the 
  @host rule. To shim this feature, the @host styles are reformatted and 
  prefixed with a given scope name and promoted to a document level stylesheet.
  For example, given a scope name of .foo, a rule like this:
  
    @host {
      * {
        background: red;
      }
    }
  
  becomes:
  
    .foo {
      background: red;
    }
  
  * encapsultion: Styles defined within ShadowDOM, apply only to 
  dom inside the ShadowDOM. Polymer uses one of two techniques to imlement
  this feature.
  
  By default, rules are prefixed with the host element tag name 
  as a descendant selector. This ensures styling does not leak out of the 'top'
  of the element's ShadowDOM. For example,

  div {
      font-weight: bold;
    }
  
  becomes:

  x-foo div {
      font-weight: bold;
    }
  
  becomes:


  Alternatively, if Platform.ShadowCSS.strictStyling is set to true then 
  selectors are scoped by adding an attribute selector suffix to each
  simple selector that contains the host element tag name. Each element 
  in the element's ShadowDOM template is also given the scope attribute. 
  Thus, these rules match only elements that have the scope attribute.
  For example, given a scope name of x-foo, a rule like this:
  
    div {
      font-weight: bold;
    }
  
  becomes:
  
    div[x-foo] {
      font-weight: bold;
    }

  Note that elements that are dynamically added to a scope must have the scope
  selector added to them manually.

  * ::pseudo: These rules are converted to rules that take advantage of the
  pseudo attribute. For example, a shadowRoot like this inside an x-foo

    <div pseudo="x-special">Special</div>

  with a rule like this:

    x-foo::x-special { ... }

  becomes:

    x-foo [pseudo=x-special] { ... }

  * ::part(): These rules are converted to rules that take advantage of the
  part attribute. For example, a shadowRoot like this inside an x-foo

    <div part="special">Special</div>

  with a rule like this:

    x-foo::part(special) { ... }

  becomes:

    x-foo [part=special] { ... }    
  
  Unaddressed ShadowDOM styling features:
  
  * upper/lower bound encapsulation: Styles which are defined outside a
  shadowRoot should not cross the ShadowDOM boundary and should not apply
  inside a shadowRoot.

  This styling behavior is not emulated. Some possible ways to do this that 
  were rejected due to complexity and/or performance concerns include: (1) reset
  every possible property for every possible selector for a given scope name;
  (2) re-implement css in javascript.
  
  As an alternative, users should make sure to use selectors
  specific to the scope in which they are working.
  
  * ::distributed: This behavior is not emulated. It's often not necessary
  to style the contents of a specific insertion point and instead, descendants
  of the host element can be styled selectively. Users can also create an 
  extra node around an insertion point and style that node's contents
  via descendent selectors. For example, with a shadowRoot like this:
  
    <style>
      content::-webkit-distributed(div) {
        background: red;
      }
    </style>
    <content></content>
  
  could become:
  
    <style>
      / *@polyfill .content-container div * / 
      content::-webkit-distributed(div) {
        background: red;
      }
    </style>
    <div class="content-container">
      <content></content>
    </div>
  
  Note the use of @polyfill in the comment above a ShadowDOM specific style
  declaration. This is a directive to the styling shim to use the selector 
  in comments in lieu of the next selector when running under polyfill.
*/
(function(scope) {

var ShadowCSS = {
  strictStyling: false,
  registry: {},
  // Shim styles for a given root associated with a name and extendsName
  // 1. cache root styles by name
  // 2. optionally tag root nodes with scope name
  // 3. shim polyfill directives /* @polyfill */ and /* @polyfill-rule */
  // 4. shim @host and scoping
  shimStyling: function(root, name, extendsName) {
    var typeExtension = this.isTypeExtension(extendsName);
    // use caching to make working with styles nodes easier and to facilitate
    // lookup of extendee
    var def = this.registerDefinition(root, name, extendsName);
    // find styles and apply shimming...
    if (this.strictStyling) {
      this.applyScopeToContent(root, name);
    }
    // insert @polyfill and @polyfill-rule rules into style elements
    // scoping process takes care of shimming these
    this.insertPolyfillDirectives(def.rootStyles);
    this.insertPolyfillRules(def.rootStyles);
    var cssText = this.stylesToShimmedCssText(def.scopeStyles, name,
        typeExtension);
    // note: we only need to do rootStyles since these are unscoped.
    cssText += this.extractPolyfillUnscopedRules(def.rootStyles);
    // provide shimmedStyle for user extensibility
    def.shimmedStyle = cssTextToStyle(cssText);
    if (root) {
      root.shimmedStyle = def.shimmedStyle;
    }
    // remove existing style elements
    for (var i=0, l=def.rootStyles.length, s; (i<l) && (s=def.rootStyles[i]); 
        i++) {
      s.parentNode.removeChild(s);
    }
    // add style to document
    addCssToDocument(cssText);
  },
  registerDefinition: function(root, name, extendsName) {
    var def = this.registry[name] = {
      root: root,
      name: name,
      extendsName: extendsName
    }
    var styles = root ? root.querySelectorAll('style') : [];
    styles = styles ? Array.prototype.slice.call(styles, 0) : [];
    def.rootStyles = styles;
    def.scopeStyles = def.rootStyles;
    var extendee = this.registry[def.extendsName];
    if (extendee && (!root || root.querySelector('shadow'))) {
      def.scopeStyles = extendee.scopeStyles.concat(def.scopeStyles);
    }
    return def;
  },
  isTypeExtension: function(extendsName) {
    return extendsName && extendsName.indexOf('-') < 0;
  },
  applyScopeToContent: function(root, name) {
    if (root) {
      // add the name attribute to each node in root.
      Array.prototype.forEach.call(root.querySelectorAll('*'),
          function(node) {
            node.setAttribute(name, '');
          });
      // and template contents too
      Array.prototype.forEach.call(root.querySelectorAll('template'),
          function(template) {
            this.applyScopeToContent(template.content, name);
          },
          this);
    }
  },
  /*
   * Process styles to convert native ShadowDOM rules that will trip
   * up the css parser; we rely on decorating the stylesheet with comments.
   * 
   * For example, we convert this rule:
   * 
   * (comment start) @polyfill :host menu-item (comment end)
   * shadow::-webkit-distributed(menu-item) {
   * 
   * to this:
   * 
   * scopeName menu-item {
   *
  **/
  insertPolyfillDirectives: function(styles) {
    if (styles) {
      Array.prototype.forEach.call(styles, function(s) {
        s.textContent = this.insertPolyfillDirectivesInCssText(s.textContent);
      }, this);
    }
  },
  insertPolyfillDirectivesInCssText: function(cssText) {
    return cssText.replace(cssPolyfillCommentRe, function(match, p1) {
      // remove end comment delimiter and add block start
      return p1.slice(0, -2) + '{';
    });
  },
  /*
   * Process styles to add rules which will only apply under the polyfill
   * 
   * For example, we convert this rule:
   * 
   * (comment start) @polyfill-rule :host menu-item { 
   * ... } (comment end)
   * 
   * to this:
   * 
   * scopeName menu-item {...}
   *
  **/
  insertPolyfillRules: function(styles) {
    if (styles) {
      Array.prototype.forEach.call(styles, function(s) {
        s.textContent = this.insertPolyfillRulesInCssText(s.textContent);
      }, this);
    }
  },
  insertPolyfillRulesInCssText: function(cssText) {
    return cssText.replace(cssPolyfillRuleCommentRe, function(match, p1) {
      // remove end comment delimiter
      return p1.slice(0, -1);
    });
  },
  /*
   * Process styles to add rules which will only apply under the polyfill
   * and do not process via CSSOM. (CSSOM is destructive to rules on rare 
   * occasions, e.g. -webkit-calc on Safari.)
   * For example, we convert this rule:
   * 
   * (comment start) @polyfill-unscoped-rule menu-item { 
   * ... } (comment end)
   * 
   * to this:
   * 
   * menu-item {...}
   *
  **/
  extractPolyfillUnscopedRules: function(styles) {
    var cssText = '';
    if (styles) {
      Array.prototype.forEach.call(styles, function(s) {
        cssText += this.extractPolyfillUnscopedRulesFromCssText(
            s.textContent) + '\n\n';
      }, this);
    }
    return cssText;
  },
  extractPolyfillUnscopedRulesFromCssText: function(cssText) {
    var r = '', matches;
    while (matches = cssPolyfillUnscopedRuleCommentRe.exec(cssText)) {
      r += matches[1].slice(0, -1) + '\n\n';
    }
    return r;
  },
  // apply @host and scope shimming
  stylesToShimmedCssText: function(styles, name, typeExtension) {
    return this.shimAtHost(styles, name, typeExtension) +
        this.shimScoping(styles, name, typeExtension);
  },
  // form: @host { .foo { declarations } }
  // becomes: scopeName.foo { declarations }
  shimAtHost: function(styles, name, typeExtension) {
    if (styles) {
      return this.convertAtHostStyles(styles, name, typeExtension);
    }
  },
  convertAtHostStyles: function(styles, name, typeExtension) {
    var cssText = stylesToCssText(styles), self = this;
    cssText = cssText.replace(hostRuleRe, function(m, p1) {
      return self.scopeHostCss(p1, name, typeExtension);
    });
    cssText = rulesToCss(this.findAtHostRules(cssToRules(cssText),
        this.makeScopeMatcher(name, typeExtension)));
    return cssText;
  },
  scopeHostCss: function(cssText, name, typeExtension) {
    var self = this;
    return cssText.replace(selectorRe, function(m, p1, p2) {
      return self.scopeHostSelector(p1, name, typeExtension) + ' ' + p2 + '\n\t';
    });
  },
  // supports scopig by name and  [is=name] syntax
  scopeHostSelector: function(selector, name, typeExtension) {
    var r = [], parts = selector.split(','), is = '[is=' + name + ']';
    parts.forEach(function(p) {
      p = p.trim();
      // selector: *|:scope -> name
      if (p.match(hostElementRe)) {
        p = p.replace(hostElementRe, typeExtension ? is + '$1$3' :
            name + '$1$3');
      // selector: .foo -> name.foo (OR) [bar] -> name[bar]
      } else if (p.match(hostFixableRe)) {
        p = typeExtension ? is + p : name + p;
      }
      r.push(p);
    }, this);
    return r.join(', ');
  },
  // consider styles that do not include component name in the selector to be
  // unscoped and in need of promotion; 
  // for convenience, also consider keyframe rules this way.
  findAtHostRules: function(cssRules, matcher) {
    return Array.prototype.filter.call(cssRules, 
      this.isHostRule.bind(this, matcher));
  },
  isHostRule: function(matcher, cssRule) {
    return (cssRule.selectorText && cssRule.selectorText.match(matcher)) ||
      (cssRule.cssRules && this.findAtHostRules(cssRule.cssRules, matcher).length) ||
      (cssRule.type == CSSRule.WEBKIT_KEYFRAMES_RULE);
  },
  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:
   * 
   *  .foo {... } 
   *  
   *  and converts this to
   *  
   *  scopeName .foo { ... }
  */
  shimScoping: function(styles, name, typeExtension) {
    if (styles) {
      return this.convertScopedStyles(styles, name, typeExtension);
    }
  },
  convertScopedStyles: function(styles, name, typeExtension) {
    var cssText = stylesToCssText(styles).replace(hostRuleRe, '');
    cssText = this.insertPolyfillHostInCssText(cssText);
    cssText = this.convertColonHost(cssText);
    cssText = this.convertPseudos(cssText);
    cssText = this.convertParts(cssText);
    cssText = this.convertCombinators(cssText);
    var rules = cssToRules(cssText);
    cssText = this.scopeRules(rules, name, typeExtension);
    return cssText;
  },
  convertPseudos: function(cssText) {
    return cssText.replace(cssPseudoRe, ' [pseudo=$1]');
  },
  convertParts: function(cssText) {
    return cssText.replace(cssPartRe, ' [part=$1]');
  },
  /*
   * convert a rule like :host(.foo) > .bar { }
   *
   * to
   *
   * scopeName.foo > .bar, .foo scopeName > .bar { }
   * 
   * and
   *
   * :host(.foo:host) .bar { ... }
   * 
   * to
   * 
   * scopeName.foo .bar { ... }
  */
  convertColonHost: function(cssText) {
    // p1 = :host, p2 = contents of (), p3 rest of rule
    return cssText.replace(cssColonHostRe, function(m, p1, p2, p3) {
      p1 = polyfillHostNoCombinator;
      if (p2) {
        if (p2.match(polyfillHost)) {
          return p1 + p2.replace(polyfillHost, '') + p3;
        } else {
          return p1 + p2 + p3 + ', ' + p2 + ' ' + p1 + p3;
        }
      } else {
        return p1 + p3;
      }
    });
  },
  /*
   * Convert ^ and ^^ combinators by replacing with space.
  */
  convertCombinators: function(cssText) {
    return cssText.replace('^^', ' ').replace('^', ' ');
  },
  // change a selector like 'div' to 'name div'
  scopeRules: function(cssRules, name, typeExtension) {
    var cssText = '';
    Array.prototype.forEach.call(cssRules, function(rule) {
      if (rule.selectorText && (rule.style && rule.style.cssText)) {
        cssText += this.scopeSelector(rule.selectorText, name, typeExtension, 
          this.strictStyling) + ' {\n\t';
        cssText += this.propertiesFromRule(rule) + '\n}\n\n';
      } else if (rule.media) {
        cssText += '@media ' + rule.media.mediaText + ' {\n';
        cssText += this.scopeRules(rule.cssRules, name);
        cssText += '\n}\n\n';
      } else if (rule.cssText) {
        cssText += rule.cssText + '\n\n';
      }
    }, this);
    return cssText;
  },
  scopeSelector: function(selector, name, typeExtension, strict) {
    var r = [], parts = selector.split(',');
    parts.forEach(function(p) {
      p = p.trim();
      if (this.selectorNeedsScoping(p, name, typeExtension)) {
        p = strict ? this.applyStrictSelectorScope(p, name) :
          this.applySimpleSelectorScope(p, name, typeExtension);
      }
      r.push(p);
    }, this);
    return r.join(', ');
  },
  selectorNeedsScoping: function(selector, name, typeExtension) {
    var re = this.makeScopeMatcher(name, typeExtension);
    return !selector.match(re);
  },
  makeScopeMatcher: function(name, typeExtension) {
    var matchScope = typeExtension ? '\\[is=[\'"]?' + name + '[\'"]?\\]' : name;
    return new RegExp('^(' + matchScope + ')' + selectorReSuffix, 'm');
  },
  // scope via name and [is=name]
  applySimpleSelectorScope: function(selector, name, typeExtension) {
    var scoper = typeExtension ? '[is=' + name + ']' : name;
    if (selector.match(polyfillHostRe)) {
      selector = selector.replace(polyfillHostNoCombinator, scoper);
      return selector.replace(polyfillHostRe, scoper + ' ');
    } else {
      return scoper + ' ' + selector;
    }
  },
  // return a selector with [name] suffix on each simple selector
  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]
  applyStrictSelectorScope: function(selector, name) {
    var splits = [' ', '>', '+', '~'],
      scoped = selector,
      attrName = '[' + name + ']';
    splits.forEach(function(sep) {
      var parts = scoped.split(sep);
      scoped = parts.map(function(p) {
        // remove :host since it should be unnecessary
        var t = p.trim().replace(polyfillHostRe, '');
        if (t && (splits.indexOf(t) < 0) && (t.indexOf(attrName) < 0)) {
          p = t.replace(/([^:]*)(:*)(.*)/, '$1' + attrName + '$2$3')
        }
        return p;
      }).join(sep);
    });
    return scoped;
  },
  insertPolyfillHostInCssText: function(selector) {
    return selector.replace(hostRe, polyfillHost).replace(colonHostRe,
        polyfillHost);
  },
  propertiesFromRule: function(rule) {
    var properties = rule.style.cssText;
    // TODO(sorvell): Chrome cssom incorrectly removes quotes from the content
    // property. (https://code.google.com/p/chromium/issues/detail?id=247231)
    if (rule.style.content && !rule.style.content.match(/['"]+/)) {
      properties = 'content: \'' + rule.style.content + '\';\n' + 
        rule.style.cssText.replace(/content:[^;]*;/g, '');
    }
    return properties;
  }
};

var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
    selectorRe = /([^{]*)({[\s\S]*?})/gim,
    hostElementRe = /(.*)((?:\*)|(?:\:scope))(.*)/,
    hostFixableRe = /^[.\[:]/,
    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
    cssPolyfillCommentRe = /\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim,
    cssPolyfillRuleCommentRe = /\/\*\s@polyfill-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim,
    cssPolyfillUnscopedRuleCommentRe = /\/\*\s@polyfill-unscoped-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim,
    cssPseudoRe = /::(x-[^\s{,(]*)/gim,
    cssPartRe = /::part\(([^)]*)\)/gim,
    // note: :host pre-processed to -host.
    cssColonHostRe = /(-host)(?:\(([^)]*)\))?([^,{]*)/gim,
    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$',
    hostRe = /@host/gim,
    colonHostRe = /\:host/gim,
    polyfillHost = '-host',
    /* host name without combinator */
    polyfillHostNoCombinator = '-host-no-combinator',
    polyfillHostRe = /-host/gim;

function stylesToCssText(styles, preserveComments) {
  var cssText = '';
  Array.prototype.forEach.call(styles, function(s) {
    cssText += s.textContent + '\n\n';
  });
  // strip comments for easier processing
  if (!preserveComments) {
    cssText = cssText.replace(cssCommentRe, '');
  }
  return cssText;
}

function cssTextToStyle(cssText) {
  var style = document.createElement('style');
  style.textContent = cssText;
  return style;
}

function cssToRules(cssText) {
  var style = cssTextToStyle(cssText);
  document.head.appendChild(style);
  var rules = style.sheet.cssRules;
  style.parentNode.removeChild(style);
  return rules;
}

function rulesToCss(cssRules) {
  for (var i=0, css=[]; i < cssRules.length; i++) {
    css.push(cssRules[i].cssText);
  }
  return css.join('\n\n');
}

function addCssToDocument(cssText) {
  if (cssText) {
    getSheet().appendChild(document.createTextNode(cssText));
  }
}

var sheet;
function getSheet() {
  if (!sheet) {
    sheet = document.createElement("style");
    sheet.setAttribute('ShadowCSSShim', '');
  }
  return sheet;
}

// add polyfill stylesheet to document
if (window.ShadowDOMPolyfill) {
  addCssToDocument('style { display: none !important; }\n');
  var head = document.querySelector('head');
  head.insertBefore(getSheet(), head.childNodes[0]);
}

// exports
scope.ShadowCSS = ShadowCSS;

})(window.Platform);
}// Copyright (c) 2012 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
window.CustomElements = {flags:{}};
// SideTable is a weak map where possible. If WeakMap is not available the
// association is stored as an expando property.
var SideTable;
// TODO(arv): WeakMap does not allow for Node etc to be keys in Firefox
if (typeof WeakMap !== 'undefined' && navigator.userAgent.indexOf('Firefox/') < 0) {
  SideTable = WeakMap;
} else {
  (function() {
    var defineProperty = Object.defineProperty;
    var counter = Date.now() % 1e9;

    SideTable = function() {
      this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
    };

    SideTable.prototype = {
      set: function(key, value) {
        var entry = key[this.name];
        if (entry && entry[0] === key)
          entry[1] = value;
        else
          defineProperty(key, this.name, {value: [key, value], writable: true});
      },
      get: function(key) {
        var entry;
        return (entry = key[this.name]) && entry[0] === key ?
            entry[1] : undefined;
      },
      delete: function(key) {
        this.set(key, undefined);
      }
    }
  })();
}

(function(global) {

  var registrationsTable = new SideTable();

  // We use setImmediate or postMessage for our future callback.
  var setImmediate = window.msSetImmediate;

  // Use post message to emulate setImmediate.
  if (!setImmediate) {
    var setImmediateQueue = [];
    var sentinel = String(Math.random());
    window.addEventListener('message', function(e) {
      if (e.data === sentinel) {
        var queue = setImmediateQueue;
        setImmediateQueue = [];
        queue.forEach(function(func) {
          func();
        });
      }
    });
    setImmediate = function(func) {
      setImmediateQueue.push(func);
      window.postMessage(sentinel, '*');
    };
  }

  // This is used to ensure that we never schedule 2 callas to setImmediate
  var isScheduled = false;

  // Keep track of observers that needs to be notified next time.
  var scheduledObservers = [];

  /**
   * Schedules |dispatchCallback| to be called in the future.
   * @param {MutationObserver} observer
   */
  function scheduleCallback(observer) {
    scheduledObservers.push(observer);
    if (!isScheduled) {
      isScheduled = true;
      setImmediate(dispatchCallbacks);
    }
  }

  function wrapIfNeeded(node) {
    return window.ShadowDOMPolyfill &&
        window.ShadowDOMPolyfill.wrapIfNeeded(node) ||
        node;
  }

  function dispatchCallbacks() {
    // http://dom.spec.whatwg.org/#mutation-observers

    isScheduled = false; // Used to allow a new setImmediate call above.

    var observers = scheduledObservers;
    scheduledObservers = [];
    // Sort observers based on their creation UID (incremental).
    observers.sort(function(o1, o2) {
      return o1.uid_ - o2.uid_;
    });

    var anyNonEmpty = false;
    observers.forEach(function(observer) {

      // 2.1, 2.2
      var queue = observer.takeRecords();
      // 2.3. Remove all transient registered observers whose observer is mo.
      removeTransientObserversFor(observer);

      // 2.4
      if (queue.length) {
        observer.callback_(queue, observer);
        anyNonEmpty = true;
      }
    });

    // 3.
    if (anyNonEmpty)
      dispatchCallbacks();
  }

  function removeTransientObserversFor(observer) {
    observer.nodes_.forEach(function(node) {
      var registrations = registrationsTable.get(node);
      if (!registrations)
        return;
      registrations.forEach(function(registration) {
        if (registration.observer === observer)
          registration.removeTransientObservers();
      });
    });
  }

  /**
   * This function is used for the "For each registered observer observer (with
   * observer's options as options) in target's list of registered observers,
   * run these substeps:" and the "For each ancestor ancestor of target, and for
   * each registered observer observer (with options options) in ancestor's list
   * of registered observers, run these substeps:" part of the algorithms. The
   * |options.subtree| is checked to ensure that the callback is called
   * correctly.
   *
   * @param {Node} target
   * @param {function(MutationObserverInit):MutationRecord} callback
   */
  function forEachAncestorAndObserverEnqueueRecord(target, callback) {
    for (var node = target; node; node = node.parentNode) {
      var registrations = registrationsTable.get(node);

      if (registrations) {
        for (var j = 0; j < registrations.length; j++) {
          var registration = registrations[j];
          var options = registration.options;

          // Only target ignores subtree.
          if (node !== target && !options.subtree)
            continue;

          var record = callback(options);
          if (record)
            registration.enqueue(record);
        }
      }
    }
  }

  var uidCounter = 0;

  /**
   * The class that maps to the DOM MutationObserver interface.
   * @param {Function} callback.
   * @constructor
   */
  function JsMutationObserver(callback) {
    this.callback_ = callback;
    this.nodes_ = [];
    this.records_ = [];
    this.uid_ = ++uidCounter;
  }

  JsMutationObserver.prototype = {
    observe: function(target, options) {
      target = wrapIfNeeded(target);

      // 1.1
      if (!options.childList && !options.attributes && !options.characterData ||

          // 1.2
          options.attributeOldValue && !options.attributes ||

          // 1.3
          options.attributeFilter && options.attributeFilter.length &&
              !options.attributes ||

          // 1.4
          options.characterDataOldValue && !options.characterData) {

        throw new SyntaxError();
      }

      var registrations = registrationsTable.get(target);
      if (!registrations)
        registrationsTable.set(target, registrations = []);

      // 2
      // If target's list of registered observers already includes a registered
      // observer associated with the context object, replace that registered
      // observer's options with options.
      var registration;
      for (var i = 0; i < registrations.length; i++) {
        if (registrations[i].observer === this) {
          registration = registrations[i];
          registration.removeListeners();
          registration.options = options;
          break;
        }
      }

      // 3.
      // Otherwise, add a new registered observer to target's list of registered
      // observers with the context object as the observer and options as the
      // options, and add target to context object's list of nodes on which it
      // is registered.
      if (!registration) {
        registration = new Registration(this, target, options);
        registrations.push(registration);
        this.nodes_.push(target);
      }

      registration.addListeners();
    },

    disconnect: function() {
      this.nodes_.forEach(function(node) {
        var registrations = registrationsTable.get(node);
        for (var i = 0; i < registrations.length; i++) {
          var registration = registrations[i];
          if (registration.observer === this) {
            registration.removeListeners();
            registrations.splice(i, 1);
            // Each node can only have one registered observer associated with
            // this observer.
            break;
          }
        }
      }, this);
      this.records_ = [];
    },

    takeRecords: function() {
      var copyOfRecords = this.records_;
      this.records_ = [];
      return copyOfRecords;
    }
  };

  /**
   * @param {string} type
   * @param {Node} target
   * @constructor
   */
  function MutationRecord(type, target) {
    this.type = type;
    this.target = target;
    this.addedNodes = [];
    this.removedNodes = [];
    this.previousSibling = null;
    this.nextSibling = null;
    this.attributeName = null;
    this.attributeNamespace = null;
    this.oldValue = null;
  }

  function copyMutationRecord(original) {
    var record = new MutationRecord(original.type, original.target);
    record.addedNodes = original.addedNodes.slice();
    record.removedNodes = original.removedNodes.slice();
    record.previousSibling = original.previousSibling;
    record.nextSibling = original.nextSibling;
    record.attributeName = original.attributeName;
    record.attributeNamespace = original.attributeNamespace;
    record.oldValue = original.oldValue;
    return record;
  };

  // We keep track of the two (possibly one) records used in a single mutation.
  var currentRecord, recordWithOldValue;

  /**
   * Creates a record without |oldValue| and caches it as |currentRecord| for
   * later use.
   * @param {string} oldValue
   * @return {MutationRecord}
   */
  function getRecord(type, target) {
    return currentRecord = new MutationRecord(type, target);
  }

  /**
   * Gets or creates a record with |oldValue| based in the |currentRecord|
   * @param {string} oldValue
   * @return {MutationRecord}
   */
  function getRecordWithOldValue(oldValue) {
    if (recordWithOldValue)
      return recordWithOldValue;
    recordWithOldValue = copyMutationRecord(currentRecord);
    recordWithOldValue.oldValue = oldValue;
    return recordWithOldValue;
  }

  function clearRecords() {
    currentRecord = recordWithOldValue = undefined;
  }

  /**
   * @param {MutationRecord} record
   * @return {boolean} Whether the record represents a record from the current
   * mutation event.
   */
  function recordRepresentsCurrentMutation(record) {
    return record === recordWithOldValue || record === currentRecord;
  }

  /**
   * Selects which record, if any, to replace the last record in the queue.
   * This returns |null| if no record should be replaced.
   *
   * @param {MutationRecord} lastRecord
   * @param {MutationRecord} newRecord
   * @param {MutationRecord}
   */
  function selectRecord(lastRecord, newRecord) {
    if (lastRecord === newRecord)
      return lastRecord;

    // Check if the the record we are adding represents the same record. If
    // so, we keep the one with the oldValue in it.
    if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord))
      return recordWithOldValue;

    return null;
  }

  /**
   * Class used to represent a registered observer.
   * @param {MutationObserver} observer
   * @param {Node} target
   * @param {MutationObserverInit} options
   * @constructor
   */
  function Registration(observer, target, options) {
    this.observer = observer;
    this.target = target;
    this.options = options;
    this.transientObservedNodes = [];
  }

  Registration.prototype = {
    enqueue: function(record) {
      var records = this.observer.records_;
      var length = records.length;

      // There are cases where we replace the last record with the new record.
      // For example if the record represents the same mutation we need to use
      // the one with the oldValue. If we get same record (this can happen as we
      // walk up the tree) we ignore the new record.
      if (records.length > 0) {
        var lastRecord = records[length - 1];
        var recordToReplaceLast = selectRecord(lastRecord, record);
        if (recordToReplaceLast) {
          records[length - 1] = recordToReplaceLast;
          return;
        }
      } else {
        scheduleCallback(this.observer);
      }

      records[length] = record;
    },

    addListeners: function() {
      this.addListeners_(this.target);
    },

    addListeners_: function(node) {
      var options = this.options;
      if (options.attributes)
        node.addEventListener('DOMAttrModified', this, true);

      if (options.characterData)
        node.addEventListener('DOMCharacterDataModified', this, true);

      if (options.childList)
        node.addEventListener('DOMNodeInserted', this, true);

      if (options.childList || options.subtree)
        node.addEventListener('DOMNodeRemoved', this, true);
    },

    removeListeners: function() {
      this.removeListeners_(this.target);
    },

    removeListeners_: function(node) {
      var options = this.options;
      if (options.attributes)
        node.removeEventListener('DOMAttrModified', this, true);

      if (options.characterData)
        node.removeEventListener('DOMCharacterDataModified', this, true);

      if (options.childList)
        node.removeEventListener('DOMNodeInserted', this, true);

      if (options.childList || options.subtree)
        node.removeEventListener('DOMNodeRemoved', this, true);
    },

    /**
     * Adds a transient observer on node. The transient observer gets removed
     * next time we deliver the change records.
     * @param {Node} node
     */
    addTransientObserver: function(node) {
      // Don't add transient observers on the target itself. We already have all
      // the required listeners set up on the target.
      if (node === this.target)
        return;

      this.addListeners_(node);
      this.transientObservedNodes.push(node);
      var registrations = registrationsTable.get(node);
      if (!registrations)
        registrationsTable.set(node, registrations = []);

      // We know that registrations does not contain this because we already
      // checked if node === this.target.
      registrations.push(this);
    },

    removeTransientObservers: function() {
      var transientObservedNodes = this.transientObservedNodes;
      this.transientObservedNodes = [];

      transientObservedNodes.forEach(function(node) {
        // Transient observers are never added to the target.
        this.removeListeners_(node);

        var registrations = registrationsTable.get(node);
        for (var i = 0; i < registrations.length; i++) {
          if (registrations[i] === this) {
            registrations.splice(i, 1);
            // Each node can only have one registered observer associated with
            // this observer.
            break;
          }
        }
      }, this);
    },

    handleEvent: function(e) {
      // Stop propagation since we are managing the propagation manually.
      // This means that other mutation events on the page will not work
      // correctly but that is by design.
      e.stopImmediatePropagation();

      switch (e.type) {
        case 'DOMAttrModified':
          // http://dom.spec.whatwg.org/#concept-mo-queue-attributes

          var name = e.attrName;
          var namespace = e.relatedNode.namespaceURI;
          var target = e.target;

          // 1.
          var record = new getRecord('attributes', target);
          record.attributeName = name;
          record.attributeNamespace = namespace;

          // 2.
          var oldValue =
              e.attrChange === MutationEvent.ADDITION ? null : e.prevValue;

          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
            // 3.1, 4.2
            if (!options.attributes)
              return;

            // 3.2, 4.3
            if (options.attributeFilter && options.attributeFilter.length &&
                options.attributeFilter.indexOf(name) === -1 &&
                options.attributeFilter.indexOf(namespace) === -1) {
              return;
            }
            // 3.3, 4.4
            if (options.attributeOldValue)
              return getRecordWithOldValue(oldValue);

            // 3.4, 4.5
            return record;
          });

          break;

        case 'DOMCharacterDataModified':
          // http://dom.spec.whatwg.org/#concept-mo-queue-characterdata
          var target = e.target;

          // 1.
          var record = getRecord('characterData', target);

          // 2.
          var oldValue = e.prevValue;


          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
            // 3.1, 4.2
            if (!options.characterData)
              return;

            // 3.2, 4.3
            if (options.characterDataOldValue)
              return getRecordWithOldValue(oldValue);

            // 3.3, 4.4
            return record;
          });

          break;

        case 'DOMNodeRemoved':
          this.addTransientObserver(e.target);
          // Fall through.
        case 'DOMNodeInserted':
          // http://dom.spec.whatwg.org/#concept-mo-queue-childlist
          var target = e.relatedNode;
          var changedNode = e.target;
          var addedNodes, removedNodes;
          if (e.type === 'DOMNodeInserted') {
            addedNodes = [changedNode];
            removedNodes = [];
          } else {

            addedNodes = [];
            removedNodes = [changedNode];
          }
          var previousSibling = changedNode.previousSibling;
          var nextSibling = changedNode.nextSibling;

          // 1.
          var record = getRecord('childList', target);
          record.addedNodes = addedNodes;
          record.removedNodes = removedNodes;
          record.previousSibling = previousSibling;
          record.nextSibling = nextSibling;

          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
            // 2.1, 3.2
            if (!options.childList)
              return;

            // 2.2, 3.3
            return record;
          });

      }

      clearRecords();
    }
  };

  global.JsMutationObserver = JsMutationObserver;

})(this);

if (!window.MutationObserver) {
  window.MutationObserver =
      window.WebKitMutationObserver ||
      window.JsMutationObserver;
  if (!MutationObserver) {
    throw new Error("no mutation observer support");
  }
}

(function(scope){

var logFlags = window.logFlags || {};

// walk the subtree rooted at node, applying 'find(element, data)' function
// to each element
// if 'find' returns true for 'element', do not search element's subtree
function findAll(node, find, data) {
  var e = node.firstElementChild;
  if (!e) {
    e = node.firstChild;
    while (e && e.nodeType !== Node.ELEMENT_NODE) {
      e = e.nextSibling;
    }
  }
  while (e) {
    if (find(e, data) !== true) {
      findAll(e, find, data);
    }
    e = e.nextElementSibling;
  }
  return null;
}

// walk all shadowRoots on a given node.
function forRoots(node, cb) {
  var root = node.shadowRoot;
  while(root) {
    forSubtree(root, cb);
    root = root.olderShadowRoot;
  }
}

// walk the subtree rooted at node, including descent into shadow-roots,
// applying 'cb' to each element
function forSubtree(node, cb) {
  //logFlags.dom && node.childNodes && node.childNodes.length && console.group('subTree: ', node);
  findAll(node, function(e) {
    if (cb(e)) {
      return true;
    }
    forRoots(e, cb);
  });
  forRoots(node, cb);
  //logFlags.dom && node.childNodes && node.childNodes.length && console.groupEnd();
}

// manage lifecycle on added node
function added(node) {
  if (upgrade(node)) {
    insertedNode(node);
    return true;
  }
  inserted(node);
}

// manage lifecycle on added node's subtree only
function addedSubtree(node) {
  forSubtree(node, function(e) {
    if (added(e)) {
      return true;
    }
  });
}

// manage lifecycle on added node and it's subtree
function addedNode(node) {
  return added(node) || addedSubtree(node);
}

// upgrade custom elements at node, if applicable
function upgrade(node) {
  if (!node.__upgraded__ && node.nodeType === Node.ELEMENT_NODE) {
    var type = node.getAttribute('is') || node.localName;
    var definition = scope.registry[type];
    if (definition) {
      logFlags.dom && console.group('upgrade:', node.localName);
      scope.upgrade(node);
      logFlags.dom && console.groupEnd();
      return true;
    }
  }
}

function insertedNode(node) {
  inserted(node);
  if (inDocument(node)) {
    forSubtree(node, function(e) {
      inserted(e);
    });
  }
}


// TODO(sorvell): on platforms without MutationObserver, mutations may not be
// reliable and therefore entered/leftView are not reliable.
// To make these callbacks less likely to fail, we defer all inserts and removes
// to give a chance for elements to be inserted into dom.
// This ensures enteredViewCallback fires for elements that are created and
// immediately added to dom.
var hasPolyfillMutations = (!window.MutationObserver ||
    (window.MutationObserver === window.JsMutationObserver));
scope.hasPolyfillMutations = hasPolyfillMutations;

var isPendingMutations = false;
var pendingMutations = [];
function deferMutation(fn) {
  pendingMutations.push(fn);
  if (!isPendingMutations) {
    isPendingMutations = true;
    var async = (window.Platform && window.Platform.endOfMicrotask) ||
        setTimeout;
    async(takeMutations);
  }
}

function takeMutations() {
  isPendingMutations = false;
  var $p = pendingMutations;
  for (var i=0, l=$p.length, p; (i<l) && (p=$p[i]); i++) {
    p();
  }
  pendingMutations = [];
}

function inserted(element) {
  if (hasPolyfillMutations) {
    deferMutation(function() {
      _inserted(element);
    });
  } else {
    _inserted(element);
  }
}

// TODO(sjmiles): if there are descents into trees that can never have inDocument(*) true, fix this
function _inserted(element) {
  // TODO(sjmiles): it's possible we were inserted and removed in the space
  // of one microtask, in which case we won't be 'inDocument' here
  // But there are other cases where we are testing for inserted without
  // specific knowledge of mutations, and must test 'inDocument' to determine
  // whether to call inserted
  // If we can factor these cases into separate code paths we can have
  // better diagnostics.
  // TODO(sjmiles): when logging, do work on all custom elements so we can
  // track behavior even when callbacks not defined
  //console.log('inserted: ', element.localName);
  if (element.enteredViewCallback || (element.__upgraded__ && logFlags.dom)) {
    logFlags.dom && console.group('inserted:', element.localName);
    if (inDocument(element)) {
      element.__inserted = (element.__inserted || 0) + 1;
      // if we are in a 'removed' state, bluntly adjust to an 'inserted' state
      if (element.__inserted < 1) {
        element.__inserted = 1;
      }
      // if we are 'over inserted', squelch the callback
      if (element.__inserted > 1) {
        logFlags.dom && console.warn('inserted:', element.localName,
          'insert/remove count:', element.__inserted)
      } else if (element.enteredViewCallback) {
        logFlags.dom && console.log('inserted:', element.localName);
        element.enteredViewCallback();
      }
    }
    logFlags.dom && console.groupEnd();
  }
}

function removedNode(node) {
  removed(node);
  forSubtree(node, function(e) {
    removed(e);
  });
}


function removed(element) {
  if (hasPolyfillMutations) {
    deferMutation(function() {
      _removed(element);
    });
  } else {
    _removed(element);
  }
}

function removed(element) {
  // TODO(sjmiles): temporary: do work on all custom elements so we can track
  // behavior even when callbacks not defined
  if (element.leftViewCallback || (element.__upgraded__ && logFlags.dom)) {
    logFlags.dom && console.log('removed:', element.localName);
    if (!inDocument(element)) {
      element.__inserted = (element.__inserted || 0) - 1;
      // if we are in a 'inserted' state, bluntly adjust to an 'removed' state
      if (element.__inserted > 0) {
        element.__inserted = 0;
      }
      // if we are 'over removed', squelch the callback
      if (element.__inserted < 0) {
        logFlags.dom && console.warn('removed:', element.localName,
            'insert/remove count:', element.__inserted)
      } else if (element.leftViewCallback) {
        element.leftViewCallback();
      }
    }
  }
}

function inDocument(element) {
  var p = element;
  var doc = window.ShadowDOMPolyfill &&
      window.ShadowDOMPolyfill.wrapIfNeeded(document) || document;
  while (p) {
    if (p == doc) {
      return true;
    }
    p = p.parentNode || p.host;
  }
}

function watchShadow(node) {
  if (node.shadowRoot && !node.shadowRoot.__watched) {
    logFlags.dom && console.log('watching shadow-root for: ', node.localName);
    // watch all unwatched roots...
    var root = node.shadowRoot;
    while (root) {
      watchRoot(root);
      root = root.olderShadowRoot;
    }
  }
}

function watchRoot(root) {
  if (!root.__watched) {
    observe(root);
    root.__watched = true;
  }
}

function filter(inNode) {
  switch (inNode.localName) {
    case 'style':
    case 'script':
    case 'template':
    case undefined:
      return true;
  }
}

function handler(mutations) {
  //
  if (logFlags.dom) {
    var mx = mutations[0];
    if (mx && mx.type === 'childList' && mx.addedNodes) {
        if (mx.addedNodes) {
          var d = mx.addedNodes[0];
          while (d && d !== document && !d.host) {
            d = d.parentNode;
          }
          var u = d && (d.URL || d._URL || (d.host && d.host.localName)) || '';
          u = u.split('/?').shift().split('/').pop();
        }
    }
    console.group('mutations (%d) [%s]', mutations.length, u || '');
  }
  //
  mutations.forEach(function(mx) {
    //logFlags.dom && console.group('mutation');
    if (mx.type === 'childList') {
      forEach(mx.addedNodes, function(n) {
        //logFlags.dom && console.log(n.localName);
        if (filter(n)) {
          return;
        }
        // nodes added may need lifecycle management
        addedNode(n);
      });
      // removed nodes may need lifecycle management
      forEach(mx.removedNodes, function(n) {
        //logFlags.dom && console.log(n.localName);
        if (filter(n)) {
          return;
        }
        removedNode(n);
      });
    }
    //logFlags.dom && console.groupEnd();
  });
  logFlags.dom && console.groupEnd();
};

var observer = new MutationObserver(handler);

function takeRecords() {
  // TODO(sjmiles): ask Raf why we have to call handler ourselves
  handler(observer.takeRecords());
  takeMutations();
}

var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);

function observe(inRoot) {
  observer.observe(inRoot, {childList: true, subtree: true});
}

function observeDocument(document) {
  observe(document);
}

function upgradeDocument(document) {
  logFlags.dom && console.group('upgradeDocument: ', (document.URL || document._URL || '').split('/').pop());
  addedNode(document);
  logFlags.dom && console.groupEnd();
}

// exports

scope.watchShadow = watchShadow;
scope.upgradeAll = addedNode;
scope.upgradeSubtree = addedSubtree;

scope.observeDocument = observeDocument;
scope.upgradeDocument = upgradeDocument;

scope.takeRecords = takeRecords;

})(window.CustomElements);

/**
 * Implements `document.register`
 * @module CustomElements
*/

/**
 * Polyfilled extensions to the `document` object.
 * @class Document
*/

(function(scope) {

// imports

if (!scope) {
  scope = window.CustomElements = {flags:{}};
}
var flags = scope.flags;

// native document.register?

var hasNative = Boolean(document.register);
var useNative = !flags.register && hasNative;

if (useNative) {

  // stub
  var nop = function() {};

  // exports
  scope.registry = {};
  scope.upgradeElement = nop;

  scope.watchShadow = nop;
  scope.upgrade = nop;
  scope.upgradeAll = nop;
  scope.upgradeSubtree = nop;
  scope.observeDocument = nop;
  scope.upgradeDocument = nop;
  scope.takeRecords = nop;

} else {

  /**
   * Registers a custom tag name with the document.
   *
   * When a registered element is created, a `readyCallback` method is called
   * in the scope of the element. The `readyCallback` method can be specified on
   * either `options.prototype` or `options.lifecycle` with the latter taking
   * precedence.
   *
   * @method register
   * @param {String} name The tag name to register. Must include a dash ('-'),
   *    for example 'x-component'.
   * @param {Object} options
   *    @param {String} [options.extends]
   *      (_off spec_) Tag name of an element to extend (or blank for a new
   *      element). This parameter is not part of the specification, but instead
   *      is a hint for the polyfill because the extendee is difficult to infer.
   *      Remember that the input prototype must chain to the extended element's
   *      prototype (or HTMLElement.prototype) regardless of the value of
   *      `extends`.
   *    @param {Object} options.prototype The prototype to use for the new
   *      element. The prototype must inherit from HTMLElement.
   *    @param {Object} [options.lifecycle]
   *      Callbacks that fire at important phases in the life of the custom
   *      element.
   *
   * @example
   *      FancyButton = document.register("fancy-button", {
   *        extends: 'button',
   *        prototype: Object.create(HTMLButtonElement.prototype, {
   *          readyCallback: {
   *            value: function() {
   *              console.log("a fancy-button was created",
   *            }
   *          }
   *        })
   *      });
   * @return {Function} Constructor for the newly registered type.
   */
  function register(name, options) {
    //console.warn('document.register("' + name + '", ', options, ')');
    // construct a defintion out of options
    // TODO(sjmiles): probably should clone options instead of mutating it
    var definition = options || {};
    if (!name) {
      // TODO(sjmiles): replace with more appropriate error (EricB can probably
      // offer guidance)
      throw new Error('document.register: first argument `name` must not be empty');
    }
    if (name.indexOf('-') < 0) {
      // TODO(sjmiles): replace with more appropriate error (EricB can probably
      // offer guidance)
      throw new Error('document.register: first argument (\'name\') must contain a dash (\'-\'). Argument provided was \'' + String(name) + '\'.');
    }
    // record name
    definition.name = name;
    // must have a prototype, default to an extension of HTMLElement
    // TODO(sjmiles): probably should throw if no prototype, check spec
    if (!definition.prototype) {
      // TODO(sjmiles): replace with more appropriate error (EricB can probably
      // offer guidance)
      throw new Error('Options missing required prototype property');
    }
    // ensure a lifecycle object so we don't have to null test it
    definition.lifecycle = definition.lifecycle || {};
    // build a list of ancestral custom elements (for native base detection)
    // TODO(sjmiles): we used to need to store this, but current code only
    // uses it in 'resolveTagName': it should probably be inlined
    definition.ancestry = ancestry(definition.extends);
    // extensions of native specializations of HTMLElement require localName
    // to remain native, and use secondary 'is' specifier for extension type
    resolveTagName(definition);
    // some platforms require modifications to the user-supplied prototype
    // chain
    resolvePrototypeChain(definition);
    // overrides to implement attributeChanged callback
    overrideAttributeApi(definition.prototype);
    // 7.1.5: Register the DEFINITION with DOCUMENT
    registerDefinition(name, definition);
    // 7.1.7. Run custom element constructor generation algorithm with PROTOTYPE
    // 7.1.8. Return the output of the previous step.
    definition.ctor = generateConstructor(definition);
    definition.ctor.prototype = definition.prototype;
    // force our .constructor to be our actual constructor
    definition.prototype.constructor = definition.ctor;
    // if initial parsing is complete
    if (scope.ready || scope.performedInitialDocumentUpgrade) {
      // upgrade any pre-existing nodes of this type
      scope.upgradeAll(document);
    }
    return definition.ctor;
  }

  function ancestry(extnds) {
    var extendee = registry[extnds];
    if (extendee) {
      return ancestry(extendee.extends).concat([extendee]);
    }
    return [];
  }

  function resolveTagName(definition) {
    // if we are explicitly extending something, that thing is our
    // baseTag, unless it represents a custom component
    var baseTag = definition.extends;
    // if our ancestry includes custom components, we only have a
    // baseTag if one of them does
    for (var i=0, a; (a=definition.ancestry[i]); i++) {
      baseTag = a.is && a.tag;
    }
    // our tag is our baseTag, if it exists, and otherwise just our name
    definition.tag = baseTag || definition.name;
    if (baseTag) {
      // if there is a base tag, use secondary 'is' specifier
      definition.is = definition.name;
    }
  }

  function resolvePrototypeChain(definition) {
    // if we don't support __proto__ we need to locate the native level
    // prototype for precise mixing in
    if (!Object.__proto__) {
      // default prototype
      var nativePrototype = HTMLElement.prototype;
      // work out prototype when using type-extension
      if (definition.is) {
        var inst = document.createElement(definition.tag);
        nativePrototype = Object.getPrototypeOf(inst);
      }
      // ensure __proto__ reference is installed at each point on the prototype
      // chain.
      // NOTE: On platforms without __proto__, a mixin strategy is used instead
      // of prototype swizzling. In this case, this generated __proto__ provides
      // limited support for prototype traversal.
      var proto = definition.prototype, ancestor;
      while (proto && (proto !== nativePrototype)) {
        var ancestor = Object.getPrototypeOf(proto);
        proto.__proto__ = ancestor;
        proto = ancestor;
      }
    }
    // cache this in case of mixin
    definition.native = nativePrototype;
  }

  // SECTION 4

  function instantiate(definition) {
    // 4.a.1. Create a new object that implements PROTOTYPE
    // 4.a.2. Let ELEMENT by this new object
    //
    // the custom element instantiation algorithm must also ensure that the
    // output is a valid DOM element with the proper wrapper in place.
    //
    return upgrade(domCreateElement(definition.tag), definition);
  }

  function upgrade(element, definition) {
    // some definitions specify an 'is' attribute
    if (definition.is) {
      element.setAttribute('is', definition.is);
    }
    // make 'element' implement definition.prototype
    implement(element, definition);
    // flag as upgraded
    element.__upgraded__ = true;
    // there should never be a shadow root on element at this point
    // we require child nodes be upgraded before `created`
    scope.upgradeSubtree(element);
    // lifecycle management
    created(element);
    // OUTPUT
    return element;
  }

  function implement(element, definition) {
    // prototype swizzling is best
    if (Object.__proto__) {
      element.__proto__ = definition.prototype;
    } else {
      // where above we can re-acquire inPrototype via
      // getPrototypeOf(Element), we cannot do so when
      // we use mixin, so we install a magic reference
      customMixin(element, definition.prototype, definition.native);
      element.__proto__ = definition.prototype;
    }
  }

  function customMixin(inTarget, inSrc, inNative) {
    // TODO(sjmiles): 'used' allows us to only copy the 'youngest' version of
    // any property. This set should be precalculated. We also need to
    // consider this for supporting 'super'.
    var used = {};
    // start with inSrc
    var p = inSrc;
    // sometimes the default is HTMLUnknownElement.prototype instead of
    // HTMLElement.prototype, so we add a test
    // the idea is to avoid mixing in native prototypes, so adding
    // the second test is WLOG
    while (p && p !== inNative && p !== HTMLUnknownElement.prototype) {
      var keys = Object.getOwnPropertyNames(p);
      for (var i=0, k; k=keys[i]; i++) {
        if (!used[k]) {
          Object.defineProperty(inTarget, k,
              Object.getOwnPropertyDescriptor(p, k));
          used[k] = 1;
        }
      }
      p = Object.getPrototypeOf(p);
    }
  }

  function created(element) {
    // invoke createdCallback
    if (element.createdCallback) {
      element.createdCallback();
    }
  }

  // attribute watching

  function overrideAttributeApi(prototype) {
    // overrides to implement callbacks
    // TODO(sjmiles): should support access via .attributes NamedNodeMap
    // TODO(sjmiles): preserves user defined overrides, if any
    var setAttribute = prototype.setAttribute;
    prototype.setAttribute = function(name, value) {
      changeAttribute.call(this, name, value, setAttribute);
    }
    var removeAttribute = prototype.removeAttribute;
    prototype.removeAttribute = function(name) {
      changeAttribute.call(this, name, null, removeAttribute);
    }
  }

  function changeAttribute(name, value, operation) {
    var oldValue = this.getAttribute(name);
    operation.apply(this, arguments);
    if (this.attributeChangedCallback
        && (this.getAttribute(name) !== oldValue)) {
      this.attributeChangedCallback(name, oldValue, value);
    }
  }

  // element registry (maps tag names to definitions)

  var registry = {};

  function registerDefinition(name, definition) {
    if (registry[name]) {
      throw new Error('Cannot register a tag more than once');
    }
    registry[name] = definition;
  }

  function generateConstructor(definition) {
    return function() {
      return instantiate(definition);
    };
  }

  function createElement(tag, typeExtension) {
    var definition = registry[typeExtension || tag];
    if (definition) {
      if (tag == definition.tag && typeExtension == definition.is) {
        return new definition.ctor();
      }
      // Handle empty string for type extension.
      if (!typeExtension && !definition.is) {
        return new definition.ctor();
      }
    }

    if (typeExtension) {
      var element = createElement(tag);
      element.setAttribute('is', typeExtension);
      return element;
    }
    var element = domCreateElement(tag);
    // Custom tags should be HTMLElements even if not upgraded.
    if (tag.indexOf('-') >= 0) {
      implement(element, HTMLElement);
    }
    return element;
  }

  function upgradeElement(element) {
    if (!element.__upgraded__ && (element.nodeType === Node.ELEMENT_NODE)) {
      var is = element.getAttribute('is');
      var definition = registry[is || element.localName];
      if (definition) {
        if (is && definition.tag == element.localName) {
          return upgrade(element, definition);
        } else if (!is && !definition.extends) {
          return upgrade(element, definition);
        }
      }
    }
  }

  function cloneNode(deep) {
    // call original clone
    var n = domCloneNode.call(this, deep);
    // upgrade the element and subtree
    scope.upgradeAll(n);
    // return the clone
    return n;
  }
  // capture native createElement before we override it

  var domCreateElement = document.createElement.bind(document);

  // capture native cloneNode before we override it

  var domCloneNode = Node.prototype.cloneNode;

  // exports

  document.register = register;
  document.createElement = createElement; // override
  Node.prototype.cloneNode = cloneNode; // override

  scope.registry = registry;

  /**
   * Upgrade an element to a custom element. Upgrading an element
   * causes the custom prototype to be applied, an `is` attribute
   * to be attached (as needed), and invocation of the `readyCallback`.
   * `upgrade` does nothing if the element is already upgraded, or
   * if it matches no registered custom tag name.
   *
   * @method ugprade
   * @param {Element} element The element to upgrade.
   * @return {Element} The upgraded element.
   */
  scope.upgrade = upgradeElement;
}

scope.hasNative = hasNative;
scope.useNative = useNative;

})(window.CustomElements);

(function() {

// import

var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : 'none';

// highlander object for parsing a document tree

var parser = {
  selectors: [
    'link[rel=' + IMPORT_LINK_TYPE + ']'
  ],
  map: {
    link: 'parseLink'
  },
  parse: function(inDocument) {
    if (!inDocument.__parsed) {
      // only parse once
      inDocument.__parsed = true;
      // all parsable elements in inDocument (depth-first pre-order traversal)
      var elts = inDocument.querySelectorAll(parser.selectors);
      // for each parsable node type, call the mapped parsing method
      forEach(elts, function(e) {
        parser[parser.map[e.localName]](e);
      });
      // upgrade all upgradeable static elements, anything dynamically
      // created should be caught by observer
      CustomElements.upgradeDocument(inDocument);
      // observe document for dom changes
      CustomElements.observeDocument(inDocument);
    }
  },
  parseLink: function(linkElt) {
    // imports
    if (isDocumentLink(linkElt)) {
      this.parseImport(linkElt);
    }
  },
  parseImport: function(linkElt) {
    if (linkElt.content) {
      parser.parse(linkElt.content);
    }
  }
};

function isDocumentLink(inElt) {
  return (inElt.localName === 'link'
      && inElt.getAttribute('rel') === IMPORT_LINK_TYPE);
}

var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);

// exports

CustomElements.parser = parser;

})();
(function(){

// bootstrap parsing
function bootstrap() {
  // parse document
  CustomElements.parser.parse(document);
  // one more pass before register is 'live'
  CustomElements.upgradeDocument(document);
  CustomElements.performedInitialDocumentUpgrade = true;
  // choose async
  var async = window.Platform && Platform.endOfMicrotask ?
    Platform.endOfMicrotask :
    setTimeout;
  async(function() {
    // set internal 'ready' flag, now document.register will trigger
    // synchronous upgrades
    CustomElements.ready = true;
    // capture blunt profiling data
    CustomElements.readyTime = Date.now();
    if (window.HTMLImports) {
      CustomElements.elapsed = CustomElements.readyTime - HTMLImports.readyTime;
    }
    // notify the system that we are bootstrapped
    document.body.dispatchEvent(
      new CustomEvent('WebComponentsReady', {bubbles: true})
    );
  });
}

// CustomEvent shim for IE
if (typeof window.CustomEvent !== 'function') {
  window.CustomEvent = function(inType) {
     var e = document.createEvent('HTMLEvents');
     e.initEvent(inType, true, true);
     return e;
  };
}

if (document.readyState === 'complete') {
  bootstrap();
} else {
  var loadEvent = window.HTMLImports ? 'HTMLImportsLoaded' :
      document.readyState == 'loading' ? 'DOMContentLoaded' : 'load';
  window.addEventListener(loadEvent, bootstrap);
}

})();

(function() {
// Patch to allow custom element and shadow dom to work together, from:
// https://github.com/Polymer/platform/blob/master/src/patches-shadowdom-polyfill.js
// include .host reference
if (HTMLElement.prototype.createShadowRoot) {
  var originalCreateShadowRoot = HTMLElement.prototype.createShadowRoot;
  HTMLElement.prototype.createShadowRoot = function() {
    var root = originalCreateShadowRoot.call(this);
    root.host = this;
    return root;
  }
}


// Patch to allow custom elements and shadow dom to work together, from:
// https://github.com/Polymer/platform/blob/master/src/patches-custom-elements.js
if (window.ShadowDOMPolyfill) {
  function nop() {};

  // disable shadow dom watching
  CustomElements.watchShadow = nop;
  CustomElements.watchAllShadows = nop;

  // ensure wrapped inputs for these functions
  var fns = ['upgradeAll', 'upgradeSubtree', 'observeDocument',
      'upgradeDocument'];

  // cache originals
  var original = {};
  fns.forEach(function(fn) {
    original[fn] = CustomElements[fn];
  });

  // override
  fns.forEach(function(fn) {
    CustomElements[fn] = function(inNode) {
      return original[fn](ShadowDOMPolyfill.wrapIfNeeded(inNode));
    };
  });
}

})();
// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// Type for remote proxies to Dart objects with dart2js.
// WARNING: do not call this constructor or rely on it being
// in the global namespace, as it may be removed.
function DartObject(o) {
  this.o = o;
}
// Generated by dart2js, the Dart to JavaScript compiler version: 1.0.0.3_r30188.
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C.c0=new A.V3("message-viewer")
C.js=new A.V3("stack-trace")
C.jF=new A.V3("isolate-list")
C.KG=new A.V3("navigation-bar")
C.Gu=new A.V3("collapsible-content")
C.bd=new A.V3("observatory-application")
C.uW=new A.V3("error-view")
C.HN=new A.V3("json-view")
C.mv=new A.V3("field-view")
C.Tl=E.Fv.prototype
C.RT=new P.a6(0)
C.OD=F.I3.prototype
C.mt=H.VM(new W.e0("change"),[W.ea])
C.T1=H.VM(new W.e0("click"),[W.Aj])
C.MD=H.VM(new W.e0("error"),[W.ew])
C.PP=H.VM(new W.e0("hashchange"),[W.ea])
C.io=H.VM(new W.e0("input"),[W.ea])
C.fK=H.VM(new W.e0("load"),[W.ew])
C.lS=A.Gk.prototype
C.PJ=N.Ds.prototype
C.W3=W.fJ.prototype
C.Dh=L.u7.prototype
C.nM=D.St.prototype
C.Nm=J.Q.prototype
C.ON=J.Pp.prototype
C.jn=J.im.prototype
C.jN=J.PE.prototype
C.CD=J.P.prototype
C.xB=J.O.prototype
C.Mc=function(hooks) {
  if (typeof dartExperimentalFixupGetTag != "function") return hooks;
  hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);
}
C.dE=function(hooks) {
  var userAgent = typeof navigator == "object" ? navigator.userAgent : "";
  if (userAgent.indexOf("Firefox") == -1) return hooks;
  var getTag = hooks.getTag;
  var quickMap = {
    "BeforeUnloadEvent": "Event",
    "DataTransfer": "Clipboard",
    "GeoGeolocation": "Geolocation",
    "WorkerMessageEvent": "MessageEvent",
    "XMLDocument": "Document"};
  function getTagFirefox(o) {
    var tag = getTag(o);
    return quickMap[tag] || tag;
  }
  hooks.getTag = getTagFirefox;
}
C.Mo=function getTagFallback(o) {
  if (o == null) return "Null";
  var constructor = o.constructor;
  if (typeof constructor == "function") {
    var name = constructor.builtin$cls;
    if (typeof name == "string") return name;
    name = constructor.name;
    if (typeof name == "string"
        && name !== ""
        && name !== "Object"
        && name !== "Function.prototype") {
      return name;
    }
  }
  var s = Object.prototype.toString.call(o);
  return s.substring(8, s.length - 1);
}
C.dK=function(getTagFallback) {
  return function(hooks) {
    if (typeof navigator != "object") return hooks;
    var userAgent = navigator.userAgent;
    if (userAgent.indexOf("Chrome") >= 0 ||
        userAgent.indexOf("DumpRenderTree") >= 0) {
      return hooks;
    }
    hooks.getTag = getTagFallback;
  };
}
C.XQ=function(hooks) { return hooks; }

C.HX=function() {
  function typeNameInChrome(obj) { return obj.constructor.name; }
  function getUnknownTag(object, tag) {
    if (/^HTML[A-Z].*Element$/.test(tag)) {
      var name = Object.prototype.toString.call(object);
      if (name == "[object Object]") return null;
      return "HTMLElement";
    }
  }
  function getUnknownTagGenericBrowser(object, tag) {
    if (object instanceof HTMLElement) return "HTMLElement";
    return getUnknownTag(object, tag);
  }
  function prototypeForTag(tag) {
    if (typeof window == "undefined") return null;
    if (typeof window[tag] == "undefined") return null;
    var constructor = window[tag];
    if (typeof constructor != "function") return null;
    return constructor.prototype;
  }
  function discriminator(tag) { return null; }
  var isBrowser = typeof navigator == "object";
  return {
    getTag: typeNameInChrome,
    getUnknownTag: isBrowser ? getUnknownTagGenericBrowser : getUnknownTag,
    prototypeForTag: prototypeForTag,
    discriminator: discriminator };
}
C.i7=    ((typeof version == "function" && typeof os == "object" && "system" in os)
    || (typeof navigator == "object"
        && navigator.userAgent.indexOf('Chrome') != -1))
        ? function(x) { return x.$dartCachedLength || x.length; }
        : function(x) { return x.length; };

C.Px=function(hooks) {
  var userAgent = typeof navigator == "object" ? navigator.userAgent : "";
  if (userAgent.indexOf("Trident/") == -1) return hooks;
  var getTag = hooks.getTag;
  var quickMap = {
    "BeforeUnloadEvent": "Event",
    "DataTransfer": "Clipboard",
    "HTMLDDElement": "HTMLElement",
    "HTMLDTElement": "HTMLElement",
    "HTMLPhraseElement": "HTMLElement",
    "Position": "Geoposition"
  };
  function getTagIE(o) {
    var tag = getTag(o);
    var newTag = quickMap[tag];
    if (newTag) return newTag;
    if (tag == "Document") {
      if (!!o.xmlVersion) return "!Document";
      return "!HTMLDocument";
    }
    if (tag == "Object") {
      if (window.DataView && (o instanceof window.DataView)) return "DataView";
    }
    return tag;
  }
  function prototypeForTagIE(tag) {
    if (tag == "Document") return null;
    var constructor = window[tag];
    if (constructor == null) return null;
    return constructor.prototype;
  }
  hooks.getTag = getTagIE;
  hooks.prototypeForTag = prototypeForTagIE;
}
C.A3=new P.QM(null)
C.jZ=Z.vj.prototype
C.VZ=new N.Ng("FINER",400)
C.R5=new N.Ng("FINE",500)
C.IF=new N.Ng("INFO",800)
C.UP=new N.Ng("WARNING",900)
C.MG=M.CX.prototype
I.makeConstantList = function(list) {
  list.immutable$list = true;
  list.fixed$length = true;
  return list;
};
C.HE=I.makeConstantList([0,0,26624,1023,0,0,65534,2047])
C.mK=I.makeConstantList([0,0,26624,1023,65534,2047,65534,2047])
C.xu=I.makeConstantList([43,45,42,47,33,38,60,61,62,63,94,124])
C.u0=I.makeConstantList(["==","!=","<=",">=","||","&&"])
C.Me=H.VM(I.makeConstantList([]),[P.Ms])
C.dn=H.VM(I.makeConstantList([]),[P.Fw])
C.hU=H.VM(I.makeConstantList([]),[P.X9])
C.xD=I.makeConstantList([])
C.Qy=I.makeConstantList(["in","this"])
C.kg=I.makeConstantList([0,0,24576,1023,65534,34815,65534,18431])
C.Wd=I.makeConstantList([0,0,32722,12287,65535,34815,65534,18431])
C.iq=I.makeConstantList([40,41,91,93,123,125])
C.zJ=I.makeConstantList(["caption","col","colgroup","option","optgroup","tbody","td","tfoot","th","thead","tr"])
C.uE=new H.LP(11,{caption:null,col:null,colgroup:null,option:null,optgroup:null,tbody:null,td:null,tfoot:null,th:null,thead:null,tr:null},C.zJ)
C.uS=I.makeConstantList(["webkitanimationstart","webkitanimationend","webkittransitionend","domfocusout","domfocusin","animationend","animationiteration","animationstart","doubleclick","fullscreenchange","fullscreenerror","keyadded","keyerror","keymessage","needkey","speechchange"])
C.FS=new H.LP(16,{webkitanimationstart:"webkitAnimationStart",webkitanimationend:"webkitAnimationEnd",webkittransitionend:"webkitTransitionEnd",domfocusout:"DOMFocusOut",domfocusin:"DOMFocusIn",animationend:"webkitAnimationEnd",animationiteration:"webkitAnimationIteration",animationstart:"webkitAnimationStart",doubleclick:"dblclick",fullscreenchange:"webkitfullscreenchange",fullscreenerror:"webkitfullscreenerror",keyadded:"webkitkeyadded",keyerror:"webkitkeyerror",keymessage:"webkitkeymessage",needkey:"webkitneedkey",speechchange:"webkitSpeechChange"},C.uS)
C.qr=I.makeConstantList(["!",":",",",")","]","}","?","||","&&","|","^","&","!=","==",">=",">","<=","<","+","-","%","/","*","(","[",".","{"])
C.dj=new H.LP(27,{"!":0,":":0,",":0,")":0,"]":0,"}":0,"?":1,"||":2,"&&":3,"|":4,"^":5,"&":6,"!=":7,"==":7,">=":8,">":8,"<=":8,"<":8,"+":9,"-":9,"%":10,"/":10,"*":10,"(":11,"[":11,".":11,"{":11},C.qr)
C.pa=I.makeConstantList(["name","extends","constructor","noscript","attributes"])
C.kr=new H.LP(5,{name:1,extends:1,constructor:1,noscript:1,attributes:1},C.pa)
C.ME=I.makeConstantList(["enumerate"])
C.va=new H.LP(1,{enumerate:K.ZO},C.ME)
C.Wp=L.Nh.prototype
C.Xg=Q.ih.prototype
C.t5=W.BH.prototype
C.k0=V.F1.prototype
C.Pf=Z.uL.prototype
C.xk=A.XP.prototype
C.GB=A.ir.prototype
C.Cc=Q.NQ.prototype
C.bg=X.uw.prototype
C.PU=new H.GD("dart.core.Object")
C.nz=new H.GD("dart.core.DateTime")
C.Ts=new H.GD("dart.core.bool")
C.A5=new H.GD("Directory")
C.pk=new H.GD("Platform")
C.fz=new H.GD("[]")
C.wh=new H.GD("app")
C.Ka=new H.GD("call")
C.XA=new H.GD("cls")
C.b1=new H.GD("code")
C.to=new H.GD("createRuntimeType")
C.Je=new H.GD("current")
C.h1=new H.GD("currentHash")
C.Jw=new H.GD("displayValue")
C.nN=new H.GD("dynamic")
C.yh=new H.GD("error")
C.Yn=new H.GD("error_obj")
C.WQ=new H.GD("field")
C.nf=new H.GD("function")
C.AZ=new H.GD("dart.core.String")
C.Di=new H.GD("iconClass")
C.eJ=new H.GD("instruction")
C.Y2=new H.GD("isolate")
C.Gd=new H.GD("json")
C.Wn=new H.GD("length")
C.EV=new H.GD("library")
C.PC=new H.GD("dart.core.int")
C.wt=new H.GD("members")
C.KY=new H.GD("messageType")
C.YS=new H.GD("name")
C.OV=new H.GD("noSuchMethod")
C.Ws=new H.GD("operatingSystem")
C.qb=new H.GD("prefix")
C.Qi=new H.GD("registerCallback")
C.wH=new H.GD("responses")
C.ok=new H.GD("dart.core.Null")
C.md=new H.GD("dart.core.double")
C.eC=new H.GD("[]=")
C.kw=new H.GD("trace")
C.ls=new H.GD("value")
C.eR=new H.GD("valueType")
C.QK=new H.GD("window")
C.vO=H.mm('br')
C.wK=new H.Lm(C.vO,"K",0)
C.SL=H.mm('Ae')
C.WX=new H.Lm(C.SL,"V",0)
C.QJ=H.mm('xh')
C.wW=new H.Lm(C.QJ,"T",0)
C.wa=new H.Lm(C.vO,"V",0)
C.Ti=H.mm('wn')
C.Mt=new H.Lm(C.Ti,"E",0)
C.qM=H.mm('F1')
C.NM=H.mm('Nh')
C.nY=H.mm('a')
C.Yc=H.mm('iP')
C.LN=H.mm('Be')
C.Qa=H.mm('u7')
C.xS=H.mm('UZ')
C.PT=H.mm('CX')
C.Op=H.mm('G8')
C.xF=H.mm('NQ')
C.b4=H.mm('ih')
C.hG=H.mm('ir')
C.dA=H.mm('Ms')
C.mo=H.mm('Fv')
C.O4=H.mm('double')
C.xE=H.mm('aC')
C.yw=H.mm('int')
C.vuj=H.mm('uw')
C.Tq=H.mm('vj')
C.CT=H.mm('St')
C.Q4=H.mm('uL')
C.yQ=H.mm('EH')
C.Db=H.mm('String')
C.yg=H.mm('I3')
C.XU=H.mm('i6')
C.Bm=H.mm('XP')
C.HL=H.mm('bool')
C.HH=H.mm('dynamic')
C.Gp=H.mm('cw')
C.Sa=H.mm('Ds')
C.CS=H.mm('vm')
C.XK=H.mm('Gk')
C.GX=H.mm('c8')
C.vB=J.is.prototype
C.dy=new P.z0(!1)
C.ol=W.K5.prototype
C.hi=H.VM(new W.kG(W.f0),[W.Lq])
C.Qq=new P.wJ(null,null,null,null,null,null,null,null,null,null,null,null)
$.lE=null
$.b9=1
$.te="$cachedFunction"
$.eb="$cachedInvocation"
$.NF=null
$.TX=null
$.x7=null
$.nw=null
$.vv=null
$.Bv=null
$.oK=null
$.tY=null
$.TH=!1
$.X3=C.NU
$.Ss=0
$.L4=null
$.PN=null
$.RL=!1
$.Y4=C.IF
$.xO=0
$.el=0
$.tW=null
$.Td=!1
$.M0=0
$.uP=!0
$.To=null
J.AA=function(a){return J.RE(a).GB(a)}
J.AB=function(a){return J.RE(a).gkU(a)}
J.AF=function(a){return J.RE(a).gIi(a)}
J.AG=function(a){return J.x(a).bu(a)}
J.B8=function(a){return J.RE(a).gQ0(a)}
J.BM=function(a,b){return J.RE(a).jx(a,b)}
J.C0=function(a,b){return J.w1(a).ez(a,b)}
J.Co=function(a){return J.RE(a).gcC(a)}
J.DA=function(a){return J.RE(a).goc(a)}
J.DB=function(a,b){return J.w1(a).Ay(a,b)}
J.Dz=function(a,b){return J.rY(a).j(a,b)}
J.EC=function(a){return J.RE(a).giC(a)}
J.EY=function(a,b){return J.RE(a).od(a,b)}
J.Eg=function(a,b){return J.rY(a).Tc(a,b)}
J.Eh=function(a,b){return J.Wx(a).O(a,b)}
J.F8=function(a){return J.RE(a).gjO(a)}
J.FN=function(a){return J.U6(a).gl0(a)}
J.FW=function(a,b){if(typeof a=="number"&&typeof b=="number")return a/b
return J.Wx(a).V(a,b)}
J.GJ=function(a,b,c,d){return J.RE(a).Y9(a,b,c,d)}
J.GK=function(a){return J.RE(a).glc(a)}
J.GP=function(a){return J.w1(a).gA(a)}
J.GS=function(a,b,c,d){return J.RE(a).rJ(a,b,c,d)}
J.GW=function(a){return J.RE(a).gn4(a)}
J.H4=function(a,b){return J.RE(a).wR(a,b)}
J.Hb=function(a,b){if(typeof a=="number"&&typeof b=="number")return a<=b
return J.Wx(a).E(a,b)}
J.Hf=function(a){return J.RE(a).gTq(a)}
J.I8=function(a,b,c){return J.rY(a).wL(a,b,c)}
J.Ib=function(a){return J.RE(a).gqh(a)}
J.Ir=function(a){return J.RE(a).gHs(a)}
J.Iz=function(a){return J.RE(a).gfY(a)}
J.J5=function(a,b){if(typeof a=="number"&&typeof b=="number")return a>=b
return J.Wx(a).F(a,b)}
J.JA=function(a,b,c){return J.rY(a).h8(a,b,c)}
J.Ja=function(a){return J.RE(a).gr9(a)}
J.K3=function(a,b){return J.RE(a).Kb(a,b)}
J.L9=function(a,b){return J.RE(a).Id(a,b)}
J.LL=function(a){return J.Wx(a).HG(a)}
J.Lp=function(a){return J.RE(a).geT(a)}
J.MK=function(a,b){return J.RE(a).Md(a,b)}
J.MQ=function(a){return J.w1(a).grZ(a)}
J.MV=function(a,b){return J.RE(a).Ih(a,b)}
J.Mu=function(a,b){return J.RE(a).sig(a,b)}
J.Mz=function(a){return J.rY(a).hc(a)}
J.Or=function(a){return J.RE(a).yx(a)}
J.Pr=function(a,b){return J.w1(a).eR(a,b)}
J.Pw=function(a,b){return J.RE(a).sxr(a,b)}
J.Pz=function(a,b){return J.RE(a).szZ(a,b)}
J.Q3=function(a,b){return J.RE(a).sr9(a,b)}
J.QE=function(a){return J.RE(a).gCd(a)}
J.RF=function(a,b){return J.RE(a).WO(a,b)}
J.Ro=function(a){return J.RE(a).gjU(a)}
J.TD=function(a){return J.RE(a).i4(a)}
J.TZ=function(a){return J.RE(a).gKV(a)}
J.Tr=function(a){return J.RE(a).gCj(a)}
J.UK=function(a,b){return J.RE(a).RR(a,b)}
J.UQ=function(a,b){if(a.constructor==Array||typeof a=="string"||H.wV(a,a[init.dispatchPropertyName]))if(b>>>0===b&&b<a.length)return a[b]
return J.U6(a).t(a,b)}
J.US=function(a,b){return J.RE(a).pr(a,b)}
J.UU=function(a,b){return J.U6(a).u8(a,b)}
J.UW=function(a){return J.RE(a).gLU(a)}
J.UX=function(a){return J.RE(a).gmW(a)}
J.V1=function(a,b){return J.w1(a).Rz(a,b)}
J.VN=function(a){return J.RE(a).gM0(a)}
J.Vm=function(a){return J.RE(a).gP(a)}
J.Vs=function(a){return J.RE(a).gQg(a)}
J.Vw=function(a,b,c){return J.U6(a).Is(a,b,c)}
J.W7=function(a){return J.RE(a).Nz(a)}
J.WB=function(a,b){if(typeof a=="number"&&typeof b=="number")return a+b
return J.Qc(a).g(a,b)}
J.WI=function(a){return J.RE(a).gG3(a)}
J.We=function(a,b){return J.RE(a).scC(a,b)}
J.Y5=function(a){return J.RE(a).gyT(a)}
J.Z0=function(a){return J.RE(a).ghr(a)}
J.Z7=function(a){if(typeof a=="number")return-a
return J.Wx(a).J(a)}
J.ZZ=function(a,b){return J.rY(a).yn(a,b)}
J.bB=function(a){return J.x(a).gbx(a)}
J.bh=function(a,b,c){return J.rY(a).JT(a,b,c)}
J.bi=function(a,b){return J.w1(a).h(a,b)}
J.bs=function(a){return J.RE(a).JP(a)}
J.c9=function(a,b){return J.RE(a).sa4(a,b)}
J.co=function(a,b){return J.rY(a).nC(a,b)}
J.e2=function(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p){return J.RE(a).nH(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p)}
J.eI=function(a,b){return J.RE(a).bA(a,b)}
J.f5=function(a){return J.RE(a).gI(a)}
J.fP=function(a){return J.RE(a).gDg(a)}
J.fU=function(a){return J.RE(a).gEX(a)}
J.hI=function(a){return J.RE(a).gUQ(a)}
J.i4=function(a,b){return J.w1(a).Zv(a,b)}
J.iY=function(a){return J.RE(a).gvc(a)}
J.iZ=function(a){return J.RE(a).gzZ(a)}
J.ja=function(a,b){return J.w1(a).Vr(a,b)}
J.jf=function(a,b){return J.x(a).T(a,b)}
J.kE=function(a,b){return J.U6(a).tg(a,b)}
J.kH=function(a,b){return J.w1(a).aN(a,b)}
J.kW=function(a,b,c){if((a.constructor==Array||H.wV(a,a[init.dispatchPropertyName]))&&!a.immutable$list&&b>>>0===b&&b<a.length)return a[b]=c
return J.w1(a).u(a,b,c)}
J.l2=function(a){return J.RE(a).gN(a)}
J.lB=function(a){return J.RE(a).gP1(a)}
J.m4=function(a){return J.RE(a).gig(a)}
J.mQ=function(a,b){if(typeof a=="number"&&typeof b=="number")return(a&b)>>>0
return J.Wx(a).i(a,b)}
J.nX=function(a){return J.RE(a).gjb(a)}
J.oE=function(a,b){return J.Qc(a).iM(a,b)}
J.og=function(a,b){return J.RE(a).sIt(a,b)}
J.p0=function(a,b){if(typeof a=="number"&&typeof b=="number")return a*b
return J.Wx(a).U(a,b)}
J.pO=function(a){return J.U6(a).gor(a)}
J.pP=function(a){return J.RE(a).gDD(a)}
J.q8=function(a){return J.U6(a).gB(a)}
J.qA=function(a){return J.w1(a).br(a)}
J.qV=function(a,b,c,d){return J.RE(a).On(a,b,c,d)}
J.qd=function(a,b,c,d){return J.RE(a).aC(a,b,c,d)}
J.rP=function(a,b){return J.RE(a).sTq(a,b)}
J.rr=function(a){return J.rY(a).bS(a)}
J.ta=function(a,b){return J.RE(a).sP(a,b)}
J.tb=function(a,b,c,d){return J.RE(a).Z1(a,b,c,d)}
J.tx=function(a){return J.RE(a).guD(a)}
J.u6=function(a,b){if(typeof a=="number"&&typeof b=="number")return a<b
return J.Wx(a).C(a,b)}
J.uH=function(a,b){return J.rY(a).Fr(a,b)}
J.uf=function(a){return J.RE(a).gxr(a)}
J.v1=function(a){return J.x(a).giO(a)}
J.vX=function(a){return J.w1(a).wg(a)}
J.vo=function(a,b){return J.w1(a).ev(a,b)}
J.w8=function(a){return J.RE(a).gkc(a)}
J.wC=function(a){return J.RE(a).cO(a)}
J.wg=function(a,b){return J.U6(a).sB(a,b)}
J.wl=function(a,b){return J.RE(a).Ch(a,b)}
J.xC=function(a,b){if(a==null)return b==null
if(typeof a!="object")return b!=null&&a===b
return J.x(a).n(a,b)}
J.xH=function(a,b){if(typeof a=="number"&&typeof b=="number")return a-b
return J.Wx(a).W(a,b)}
J.xZ=function(a,b){if(typeof a=="number"&&typeof b=="number")return a>b
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J.z2=function(a){return J.RE(a).gG1(a)}
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Ps.prototype.gLU=function(receiver){return receiver.href}
Ps.prototype.gN=function(receiver){return receiver.target}
Ps.prototype.gr9=function(receiver){return receiver.type}
Ps.prototype.sr9=function(receiver,v){return receiver.type=v}
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fY.prototype.gN=function(receiver){return receiver.target}
function Mr(){}Mr.builtin$cls="Mr"
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nB.prototype.gN=function(receiver){return receiver.target}
function i3(){}i3.builtin$cls="i3"
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QW.prototype.sr9=function(receiver,v){return receiver.type=v}
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QW.prototype.sP=function(receiver,v){return receiver.value=v}
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function Em(){}Em.builtin$cls="Em"
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cv.prototype.gxr=function(receiver){return receiver.className}
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ea.prototype.sIt=function(receiver,v){return receiver._selector=v}
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ea.prototype.gIi=function(receiver){return receiver.path}
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if($desc instanceof Array)$desc=$desc[1]
ou.prototype=$desc
function S9(a){this.a=a}S9.builtin$cls="S9"
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if($desc instanceof Array)$desc=$desc[1]
S9.prototype=$desc
function ey(X5,vv,OX,OB,H9,lX,zN){this.X5=X5
this.vv=vv
this.OX=OX
this.OB=OB
this.H9=H9
this.lX=lX
this.zN=zN}ey.builtin$cls="ey"
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if($desc instanceof Array)$desc=$desc[1]
ey.prototype=$desc
function xd(m6,Q6,bR,X5,vv,OX,OB,H9,lX,zN){this.m6=m6
this.Q6=Q6
this.bR=bR
this.X5=X5
this.vv=vv
this.OX=OX
this.OB=OB
this.H9=H9
this.lX=lX
this.zN=zN}xd.builtin$cls="xd"
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if($desc instanceof Array)$desc=$desc[1]
xd.prototype=$desc
function v6(a){this.a=a}v6.builtin$cls="v6"
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if($desc instanceof Array)$desc=$desc[1]
v6.prototype=$desc
function db(kh,S4,DG,zQ){this.kh=kh
this.S4=S4
this.DG=DG
this.zQ=zQ}db.builtin$cls="db"
if(!"name" in db)db.name="db"
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if($desc instanceof Array)$desc=$desc[1]
db.prototype=$desc
db.prototype.gkh=function(){return this.kh}
db.prototype.gS4=function(){return this.S4}
db.prototype.sS4=function(v){return this.S4=v}
db.prototype.gDG=function(){return this.DG}
db.prototype.sDG=function(v){return this.DG=v}
db.prototype.gzQ=function(){return this.zQ}
db.prototype.szQ=function(v){return this.zQ=v}
function Cm(Fb){this.Fb=Fb}Cm.builtin$cls="Cm"
if(!"name" in Cm)Cm.name="Cm"
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if($desc instanceof Array)$desc=$desc[1]
Cm.prototype=$desc
function N6(Fb,zN,zq,fD){this.Fb=Fb
this.zN=zN
this.zq=zq
this.fD=fD}N6.builtin$cls="N6"
if(!"name" in N6)N6.name="N6"
$desc=$collectedClasses.N6
if($desc instanceof Array)$desc=$desc[1]
N6.prototype=$desc
function jg(){}jg.builtin$cls="jg"
if(!"name" in jg)jg.name="jg"
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if($desc instanceof Array)$desc=$desc[1]
jg.prototype=$desc
function YO(X5,vv,OX,OB,DM){this.X5=X5
this.vv=vv
this.OX=OX
this.OB=OB
this.DM=DM}YO.builtin$cls="YO"
if(!"name" in YO)YO.name="YO"
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if($desc instanceof Array)$desc=$desc[1]
YO.prototype=$desc
function oz(O2,DM,zi,fD){this.O2=O2
this.DM=DM
this.zi=zi
this.fD=fD}oz.builtin$cls="oz"
if(!"name" in oz)oz.name="oz"
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if($desc instanceof Array)$desc=$desc[1]
oz.prototype=$desc
function b6(X5,vv,OX,OB,H9,lX,zN){this.X5=X5
this.vv=vv
this.OX=OX
this.OB=OB
this.H9=H9
this.lX=lX
this.zN=zN}b6.builtin$cls="b6"
if(!"name" in b6)b6.name="b6"
$desc=$collectedClasses.b6
if($desc instanceof Array)$desc=$desc[1]
b6.prototype=$desc
function ef(Gc,DG,zQ){this.Gc=Gc
this.DG=DG
this.zQ=zQ}ef.builtin$cls="ef"
if(!"name" in ef)ef.name="ef"
$desc=$collectedClasses.ef
if($desc instanceof Array)$desc=$desc[1]
ef.prototype=$desc
ef.prototype.gGc=function(){return this.Gc}
ef.prototype.gDG=function(){return this.DG}
ef.prototype.sDG=function(v){return this.DG=v}
ef.prototype.gzQ=function(){return this.zQ}
ef.prototype.szQ=function(v){return this.zQ=v}
function zQ(O2,zN,zq,fD){this.O2=O2
this.zN=zN
this.zq=zq
this.fD=fD}zQ.builtin$cls="zQ"
if(!"name" in zQ)zQ.name="zQ"
$desc=$collectedClasses.zQ
if($desc instanceof Array)$desc=$desc[1]
zQ.prototype=$desc
function Yp(G4){this.G4=G4}Yp.builtin$cls="Yp"
if(!"name" in Yp)Yp.name="Yp"
$desc=$collectedClasses.Yp
if($desc instanceof Array)$desc=$desc[1]
Yp.prototype=$desc
function u3(){}u3.builtin$cls="u3"
if(!"name" in u3)u3.name="u3"
$desc=$collectedClasses.u3
if($desc instanceof Array)$desc=$desc[1]
u3.prototype=$desc
function mW(){}mW.builtin$cls="mW"
if(!"name" in mW)mW.name="mW"
$desc=$collectedClasses.mW
if($desc instanceof Array)$desc=$desc[1]
mW.prototype=$desc
function ar(){}ar.builtin$cls="ar"
if(!"name" in ar)ar.name="ar"
$desc=$collectedClasses.ar
if($desc instanceof Array)$desc=$desc[1]
ar.prototype=$desc
function lD(){}lD.builtin$cls="lD"
if(!"name" in lD)lD.name="lD"
$desc=$collectedClasses.lD
if($desc instanceof Array)$desc=$desc[1]
lD.prototype=$desc
function W0(a,b){this.a=a
this.b=b}W0.builtin$cls="W0"
if(!"name" in W0)W0.name="W0"
$desc=$collectedClasses.W0
if($desc instanceof Array)$desc=$desc[1]
W0.prototype=$desc
function Sw(v5,av,HV,qT){this.v5=v5
this.av=av
this.HV=HV
this.qT=qT}Sw.builtin$cls="Sw"
if(!"name" in Sw)Sw.name="Sw"
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if($desc instanceof Array)$desc=$desc[1]
Sw.prototype=$desc
function o0(Lz,dP,qT,Dc,fD){this.Lz=Lz
this.dP=dP
this.qT=qT
this.Dc=Dc
this.fD=fD}o0.builtin$cls="o0"
if(!"name" in o0)o0.name="o0"
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if($desc instanceof Array)$desc=$desc[1]
o0.prototype=$desc
function a1(G3,Bb,T8){this.G3=G3
this.Bb=Bb
this.T8=T8}a1.builtin$cls="a1"
if(!"name" in a1)a1.name="a1"
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if($desc instanceof Array)$desc=$desc[1]
a1.prototype=$desc
a1.prototype.gG3=function(receiver){return this.G3}
a1.prototype.gBb=function(receiver){return this.Bb}
a1.prototype.gT8=function(receiver){return this.T8}
function jp(P,G3,Bb,T8){this.P=P
this.G3=G3
this.Bb=Bb
this.T8=T8}jp.builtin$cls="jp"
if(!"name" in jp)jp.name="jp"
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if($desc instanceof Array)$desc=$desc[1]
jp.prototype=$desc
jp.prototype.gP=function(receiver){return this.P}
jp.prototype.sP=function(receiver,v){return this.P=v}
function Xt(){}Xt.builtin$cls="Xt"
if(!"name" in Xt)Xt.name="Xt"
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if($desc instanceof Array)$desc=$desc[1]
Xt.prototype=$desc
function Ba(Cw,bR,aY,iW,J0,qT,bb){this.Cw=Cw
this.bR=bR
this.aY=aY
this.iW=iW
this.J0=J0
this.qT=qT
this.bb=bb}Ba.builtin$cls="Ba"
if(!"name" in Ba)Ba.name="Ba"
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if($desc instanceof Array)$desc=$desc[1]
Ba.prototype=$desc
function An(a){this.a=a}An.builtin$cls="An"
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if($desc instanceof Array)$desc=$desc[1]
An.prototype=$desc
function LD(a,b,c){this.a=a
this.b=b
this.c=c}LD.builtin$cls="LD"
if(!"name" in LD)LD.name="LD"
$desc=$collectedClasses.LD
if($desc instanceof Array)$desc=$desc[1]
LD.prototype=$desc
function YI(){}YI.builtin$cls="YI"
if(!"name" in YI)YI.name="YI"
$desc=$collectedClasses.YI
if($desc instanceof Array)$desc=$desc[1]
YI.prototype=$desc
function OG(Dn){this.Dn=Dn}OG.builtin$cls="OG"
if(!"name" in OG)OG.name="OG"
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if($desc instanceof Array)$desc=$desc[1]
OG.prototype=$desc
function ro(Fb){this.Fb=Fb}ro.builtin$cls="ro"
if(!"name" in ro)ro.name="ro"
$desc=$collectedClasses.ro
if($desc instanceof Array)$desc=$desc[1]
ro.prototype=$desc
function DN(Dn,Ln,qT,bb,ya){this.Dn=Dn
this.Ln=Ln
this.qT=qT
this.bb=bb
this.ya=ya}DN.builtin$cls="DN"
if(!"name" in DN)DN.name="DN"
$desc=$collectedClasses.DN
if($desc instanceof Array)$desc=$desc[1]
DN.prototype=$desc
function ZM(Dn,Ln,qT,bb,ya){this.Dn=Dn
this.Ln=Ln
this.qT=qT
this.bb=bb
this.ya=ya}ZM.builtin$cls="ZM"
if(!"name" in ZM)ZM.name="ZM"
$desc=$collectedClasses.ZM
if($desc instanceof Array)$desc=$desc[1]
ZM.prototype=$desc
function HW(Dn,Ln,qT,bb,ya){this.Dn=Dn
this.Ln=Ln
this.qT=qT
this.bb=bb
this.ya=ya}HW.builtin$cls="HW"
if(!"name" in HW)HW.name="HW"
$desc=$collectedClasses.HW
if($desc instanceof Array)$desc=$desc[1]
HW.prototype=$desc
function JC(){}JC.builtin$cls="JC"
if(!"name" in JC)JC.name="JC"
$desc=$collectedClasses.JC
if($desc instanceof Array)$desc=$desc[1]
JC.prototype=$desc
function f1(a){this.a=a}f1.builtin$cls="f1"
if(!"name" in f1)f1.name="f1"
$desc=$collectedClasses.f1
if($desc instanceof Array)$desc=$desc[1]
f1.prototype=$desc
function Uk(){}Uk.builtin$cls="Uk"
if(!"name" in Uk)Uk.name="Uk"
$desc=$collectedClasses.Uk
if($desc instanceof Array)$desc=$desc[1]
Uk.prototype=$desc
function wI(){}wI.builtin$cls="wI"
if(!"name" in wI)wI.name="wI"
$desc=$collectedClasses.wI
if($desc instanceof Array)$desc=$desc[1]
wI.prototype=$desc
function ob(){}ob.builtin$cls="ob"
if(!"name" in ob)ob.name="ob"
$desc=$collectedClasses.ob
if($desc instanceof Array)$desc=$desc[1]
ob.prototype=$desc
function by(){}by.builtin$cls="by"
if(!"name" in by)by.name="by"
$desc=$collectedClasses.by
if($desc instanceof Array)$desc=$desc[1]
by.prototype=$desc
function QM(N5){this.N5=N5}QM.builtin$cls="QM"
if(!"name" in QM)QM.name="QM"
$desc=$collectedClasses.QM
if($desc instanceof Array)$desc=$desc[1]
QM.prototype=$desc
function z0(lH){this.lH=lH}z0.builtin$cls="z0"
if(!"name" in z0)z0.name="z0"
$desc=$collectedClasses.z0
if($desc instanceof Array)$desc=$desc[1]
z0.prototype=$desc
function Vx(){}Vx.builtin$cls="Vx"
if(!"name" in Vx)Vx.name="Vx"
$desc=$collectedClasses.Vx
if($desc instanceof Array)$desc=$desc[1]
Vx.prototype=$desc
function Rw(WF,An,EN){this.WF=WF
this.An=An
this.EN=EN}Rw.builtin$cls="Rw"
if(!"name" in Rw)Rw.name="Rw"
$desc=$collectedClasses.Rw
if($desc instanceof Array)$desc=$desc[1]
Rw.prototype=$desc
function h0(a){this.a=a}h0.builtin$cls="h0"
if(!"name" in h0)h0.name="h0"
$desc=$collectedClasses.h0
if($desc instanceof Array)$desc=$desc[1]
h0.prototype=$desc
function CL(a){this.a=a}CL.builtin$cls="CL"
if(!"name" in CL)CL.name="CL"
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if($desc instanceof Array)$desc=$desc[1]
CL.prototype=$desc
function K8(OF){this.OF=OF}K8.builtin$cls="K8"
if(!"name" in K8)K8.name="K8"
$desc=$collectedClasses.K8
if($desc instanceof Array)$desc=$desc[1]
K8.prototype=$desc
function a2(){}a2.builtin$cls="a2"
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if($desc instanceof Array)$desc=$desc[1]
a2.prototype=$desc
function fR(){}fR.builtin$cls="fR"
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if($desc instanceof Array)$desc=$desc[1]
fR.prototype=$desc
function iP(rq,aL){this.rq=rq
this.aL=aL}iP.builtin$cls="iP"
if(!"name" in iP)iP.name="iP"
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if($desc instanceof Array)$desc=$desc[1]
iP.prototype=$desc
iP.prototype.grq=function(){return this.rq}
function MF(){}MF.builtin$cls="MF"
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if($desc instanceof Array)$desc=$desc[1]
MF.prototype=$desc
function Rq(){}Rq.builtin$cls="Rq"
if(!"name" in Rq)Rq.name="Rq"
$desc=$collectedClasses.Rq
if($desc instanceof Array)$desc=$desc[1]
Rq.prototype=$desc
function Hn(){}Hn.builtin$cls="Hn"
if(!"name" in Hn)Hn.name="Hn"
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if($desc instanceof Array)$desc=$desc[1]
Hn.prototype=$desc
function Zl(){}Zl.builtin$cls="Zl"
if(!"name" in Zl)Zl.name="Zl"
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if($desc instanceof Array)$desc=$desc[1]
Zl.prototype=$desc
function pl(){}pl.builtin$cls="pl"
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if($desc instanceof Array)$desc=$desc[1]
pl.prototype=$desc
function a6(Fq){this.Fq=Fq}a6.builtin$cls="a6"
if(!"name" in a6)a6.name="a6"
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if($desc instanceof Array)$desc=$desc[1]
a6.prototype=$desc
a6.prototype.gFq=function(){return this.Fq}
function P7(){}P7.builtin$cls="P7"
if(!"name" in P7)P7.name="P7"
$desc=$collectedClasses.P7
if($desc instanceof Array)$desc=$desc[1]
P7.prototype=$desc
function DW(){}DW.builtin$cls="DW"
if(!"name" in DW)DW.name="DW"
$desc=$collectedClasses.DW
if($desc instanceof Array)$desc=$desc[1]
DW.prototype=$desc
function Ge(){}Ge.builtin$cls="Ge"
if(!"name" in Ge)Ge.name="Ge"
$desc=$collectedClasses.Ge
if($desc instanceof Array)$desc=$desc[1]
Ge.prototype=$desc
function LK(){}LK.builtin$cls="LK"
if(!"name" in LK)LK.name="LK"
$desc=$collectedClasses.LK
if($desc instanceof Array)$desc=$desc[1]
LK.prototype=$desc
function AT(G1){this.G1=G1}AT.builtin$cls="AT"
if(!"name" in AT)AT.name="AT"
$desc=$collectedClasses.AT
if($desc instanceof Array)$desc=$desc[1]
AT.prototype=$desc
AT.prototype.gG1=function(receiver){return this.G1}
function bJ(G1){this.G1=G1}bJ.builtin$cls="bJ"
if(!"name" in bJ)bJ.name="bJ"
$desc=$collectedClasses.bJ
if($desc instanceof Array)$desc=$desc[1]
bJ.prototype=$desc
function mp(uF,UP,mP,SA,vG){this.uF=uF
this.UP=UP
this.mP=mP
this.SA=SA
this.vG=vG}mp.builtin$cls="mp"
if(!"name" in mp)mp.name="mp"
$desc=$collectedClasses.mp
if($desc instanceof Array)$desc=$desc[1]
mp.prototype=$desc
function ub(G1){this.G1=G1}ub.builtin$cls="ub"
if(!"name" in ub)ub.name="ub"
$desc=$collectedClasses.ub
if($desc instanceof Array)$desc=$desc[1]
ub.prototype=$desc
ub.prototype.gG1=function(receiver){return this.G1}
function ds(G1){this.G1=G1}ds.builtin$cls="ds"
if(!"name" in ds)ds.name="ds"
$desc=$collectedClasses.ds
if($desc instanceof Array)$desc=$desc[1]
ds.prototype=$desc
ds.prototype.gG1=function(receiver){return this.G1}
function lj(G1){this.G1=G1}lj.builtin$cls="lj"
if(!"name" in lj)lj.name="lj"
$desc=$collectedClasses.lj
if($desc instanceof Array)$desc=$desc[1]
lj.prototype=$desc
lj.prototype.gG1=function(receiver){return this.G1}
function UV(YA){this.YA=YA}UV.builtin$cls="UV"
if(!"name" in UV)UV.name="UV"
$desc=$collectedClasses.UV
if($desc instanceof Array)$desc=$desc[1]
UV.prototype=$desc
function VS(){}VS.builtin$cls="VS"
if(!"name" in VS)VS.name="VS"
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if($desc instanceof Array)$desc=$desc[1]
VS.prototype=$desc
function t7(Wo){this.Wo=Wo}t7.builtin$cls="t7"
if(!"name" in t7)t7.name="t7"
$desc=$collectedClasses.t7
if($desc instanceof Array)$desc=$desc[1]
t7.prototype=$desc
function HG(G1){this.G1=G1}HG.builtin$cls="HG"
if(!"name" in HG)HG.name="HG"
$desc=$collectedClasses.HG
if($desc instanceof Array)$desc=$desc[1]
HG.prototype=$desc
HG.prototype.gG1=function(receiver){return this.G1}
function aE(G1){this.G1=G1}aE.builtin$cls="aE"
if(!"name" in aE)aE.name="aE"
$desc=$collectedClasses.aE
if($desc instanceof Array)$desc=$desc[1]
aE.prototype=$desc
aE.prototype.gG1=function(receiver){return this.G1}
function kM(oc){this.oc=oc}kM.builtin$cls="kM"
if(!"name" in kM)kM.name="kM"
$desc=$collectedClasses.kM
if($desc instanceof Array)$desc=$desc[1]
kM.prototype=$desc
kM.prototype.goc=function(receiver){return this.oc}
function EH(){}EH.builtin$cls="EH"
if(!"name" in EH)EH.name="EH"
$desc=$collectedClasses.EH
if($desc instanceof Array)$desc=$desc[1]
EH.prototype=$desc
function cX(){}cX.builtin$cls="cX"
if(!"name" in cX)cX.name="cX"
$desc=$collectedClasses.cX
if($desc instanceof Array)$desc=$desc[1]
cX.prototype=$desc
function Fl(){}Fl.builtin$cls="Fl"
if(!"name" in Fl)Fl.name="Fl"
$desc=$collectedClasses.Fl
if($desc instanceof Array)$desc=$desc[1]
Fl.prototype=$desc
function L8(){}L8.builtin$cls="L8"
if(!"name" in L8)L8.name="L8"
$desc=$collectedClasses.L8
if($desc instanceof Array)$desc=$desc[1]
L8.prototype=$desc
function c8(){}c8.builtin$cls="c8"
if(!"name" in c8)c8.name="c8"
$desc=$collectedClasses.c8
if($desc instanceof Array)$desc=$desc[1]
c8.prototype=$desc
function a(){}a.builtin$cls="a"
if(!"name" in a)a.name="a"
$desc=$collectedClasses.a
if($desc instanceof Array)$desc=$desc[1]
a.prototype=$desc
function Od(){}Od.builtin$cls="Od"
if(!"name" in Od)Od.name="Od"
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if($desc instanceof Array)$desc=$desc[1]
Od.prototype=$desc
function mE(){}mE.builtin$cls="mE"
if(!"name" in mE)mE.name="mE"
$desc=$collectedClasses.mE
if($desc instanceof Array)$desc=$desc[1]
mE.prototype=$desc
function WU(Qk,SU,Oq,Wn){this.Qk=Qk
this.SU=SU
this.Oq=Oq
this.Wn=Wn}WU.builtin$cls="WU"
if(!"name" in WU)WU.name="WU"
$desc=$collectedClasses.WU
if($desc instanceof Array)$desc=$desc[1]
WU.prototype=$desc
function Rn(vM){this.vM=vM}Rn.builtin$cls="Rn"
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if($desc instanceof Array)$desc=$desc[1]
Rn.prototype=$desc
Rn.prototype.gvM=function(){return this.vM}
function wv(){}wv.builtin$cls="wv"
if(!"name" in wv)wv.name="wv"
$desc=$collectedClasses.wv
if($desc instanceof Array)$desc=$desc[1]
wv.prototype=$desc
function uq(){}uq.builtin$cls="uq"
if(!"name" in uq)uq.name="uq"
$desc=$collectedClasses.uq
if($desc instanceof Array)$desc=$desc[1]
uq.prototype=$desc
function iD(NN,HC,r0,Fi,iV,tP,BJ,MS,yW){this.NN=NN
this.HC=HC
this.r0=r0
this.Fi=Fi
this.iV=iV
this.tP=tP
this.BJ=BJ
this.MS=MS
this.yW=yW}iD.builtin$cls="iD"
if(!"name" in iD)iD.name="iD"
$desc=$collectedClasses.iD
if($desc instanceof Array)$desc=$desc[1]
iD.prototype=$desc
function hb(){}hb.builtin$cls="hb"
if(!"name" in hb)hb.name="hb"
$desc=$collectedClasses.hb
if($desc instanceof Array)$desc=$desc[1]
hb.prototype=$desc
function XX(){}XX.builtin$cls="XX"
if(!"name" in XX)XX.name="XX"
$desc=$collectedClasses.XX
if($desc instanceof Array)$desc=$desc[1]
XX.prototype=$desc
function Kd(){}Kd.builtin$cls="Kd"
if(!"name" in Kd)Kd.name="Kd"
$desc=$collectedClasses.Kd
if($desc instanceof Array)$desc=$desc[1]
Kd.prototype=$desc
function yZ(a,b){this.a=a
this.b=b}yZ.builtin$cls="yZ"
if(!"name" in yZ)yZ.name="yZ"
$desc=$collectedClasses.yZ
if($desc instanceof Array)$desc=$desc[1]
yZ.prototype=$desc
function Gs(){}Gs.builtin$cls="Gs"
if(!"name" in Gs)Gs.name="Gs"
$desc=$collectedClasses.Gs
if($desc instanceof Array)$desc=$desc[1]
Gs.prototype=$desc
function pm(){}pm.builtin$cls="pm"
if(!"name" in pm)pm.name="pm"
$desc=$collectedClasses.pm
if($desc instanceof Array)$desc=$desc[1]
pm.prototype=$desc
function Tw(){}Tw.builtin$cls="Tw"
if(!"name" in Tw)Tw.name="Tw"
$desc=$collectedClasses.Tw
if($desc instanceof Array)$desc=$desc[1]
Tw.prototype=$desc
function wm(b,c,d){this.b=b
this.c=c
this.d=d}wm.builtin$cls="wm"
if(!"name" in wm)wm.name="wm"
$desc=$collectedClasses.wm
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