tree e9934be177bda1ae8438049f891399a3162e6cf2
parent b1ed41603f5762710b966e693af299876602ecb3
author Sigmund Cherem <sigmund@google.com> 1478043466 -0700
committer Sigmund Cherem <sigmund@google.com> 1478043466 -0700

Add defer-layout tool.

This is a simple tool to tell you how libraries map to output units. Here is an
example output of the tool:

  Output unit main:
    loaded by default
    contains:
       - hello_world.dart
       - dart:core
       - dart:_internal
       - dart:_js_primitives
       - dart:_js_helper
       - dart:collection
       - dart:_interceptors
       - dart:_isolate_helper
       - dart:async
       - dart:_js_names
       - dart:_foreign_helper
       - dart:_js_embedded_names
       - dart:isolate
       - dart:_async_await_error_codes

  Output unit 2:
    loaded by importing: [a, b]
    contains:
       - c.dart

  Output unit 1:
    loaded by importing: [a]
    contains:
       - a.dart

  Output unit 3:
    loaded by importing: [b]
    contains:
       - b.dart

BUG=
R=het@google.com

Review URL: https://codereview.chromium.org//2469963002 .