Migrated http_request_pipeling_test from SDK. (#40)

diff --git a/test/http_request_pipeling_test.dart b/test/http_request_pipeling_test.dart
new file mode 100644
index 0000000..6aa4131
--- /dev/null
+++ b/test/http_request_pipeling_test.dart
@@ -0,0 +1,42 @@
+// Copyright (c) 2018, 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.
+
+import 'dart:async';
+import 'dart:io' show Socket;
+
+import 'package:http_io/http_io.dart';
+import 'package:test/test.dart';
+
+Future<Null> requestPipeling() {
+  final completer = new Completer<Null>();
+  final int REQUEST_COUNT = 100;
+  int count = 0;
+  HttpServer.bind("127.0.0.1", 0).then((server) {
+    server.listen((HttpRequest request) {
+      count++;
+      request.response.write(request.uri.path);
+      request.response.close();
+      if (request.uri.path == "/done") {
+        request.response.done.then((_) {
+          expect(REQUEST_COUNT + 1, equals(count));
+          server.close();
+          completer.complete();
+        });
+      }
+    });
+    Socket.connect("127.0.0.1", server.port).then((s) {
+      s.listen((data) {});
+      for (int i = 0; i < REQUEST_COUNT; i++) {
+        s.write("GET /$i HTTP/1.1\r\nX-Header-1: 111\r\n\r\n");
+      }
+      s.write("GET /done HTTP/1.1\r\nConnection: close\r\n\r\n");
+      s.close();
+    });
+  });
+  return completer.future;
+}
+
+void main() {
+  test('httpRequestPipeling', requestPipeling);
+}