Add an HTML implementation of WebSocketChannel.

test/html_test_server.dart

Index: test/html_test_server.dart
diff --git a/test/html_test_server.dart b/test/html_test_server.dart
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index 0000000000000000000000000000000000000000..e356695310fdeb3f8be3ca5051a6124c644e7456
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+++ b/test/html_test_server.dart
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+// Copyright (c) 2016, 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:io';
+
+main() async {
+  var server = await HttpServer.bind("localhost", 1234);
+  server.transform(new WebSocketTransformer()).listen((webSocket) {
+    print("connected");
+    webSocket.listen((request) {
+      print("got $request");
+      webSocket.add(request);
+    });
+  });
+}