Added DOM MessagePort support.

client/dom/generated/src/interface/MessagePort.dart

 // Copyright (c) 2011, 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.
 
 // WARNING: Do not edit - generated code.
 
 interface MessagePort extends EventTarget {
+
+  EventListener get onmessage();
+
+  void set onmessage(EventListener value);
+
+  void addEventListener(String type, EventListener listener, [bool useCapture]);
+
+  void close();
+
+  bool dispatchEvent(Event evt);
+
+  void postMessage(String message);

[Anton Muhin, 2011/10/11 11:24:53]

intentionally no support for additional messagePorts (cf. WebCore IDLs)?

+
+  void removeEventListener(String type, EventListener listener, [bool useCapture]);
+
+  void start();
+
+  void webkitPostMessage(String message);
 }