Generate EventListener attributes of non-EventTarget classes.

client/dom/generated/src/wrapping/_DedicatedWorkerContextWrappingImplementation.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.
 
 class _DedicatedWorkerContextWrappingImplementation extends _WorkerContextWrappingImplementation implements DedicatedWorkerContext {
   _DedicatedWorkerContextWrappingImplementation() : super() {}
 
   static create__DedicatedWorkerContextWrappingImplementation() native {
     return new _DedicatedWorkerContextWrappingImplementation();
   }
 
+  EventListener get onmessage() { return _get_onmessage(this); }
+  static EventListener _get_onmessage(var _this) native;
+
+  void set onmessage(EventListener value) { _set_onmessage(this, value); }
+  static void _set_onmessage(var _this, EventListener value) native;
+
   void postMessage(Object message, [List messagePorts = null]) {
     if (messagePorts === null) {
       _postMessage(this, message);
       return;
     } else {
       _postMessage_2(this, message, messagePorts);
       return;
     }
   }
   static void _postMessage(receiver, message) native;
   static void _postMessage_2(receiver, message, messagePorts) native;
 
   void webkitPostMessage(Object message, [List transferList = null]) {
     if (transferList === null) {
       _webkitPostMessage(this, message);
       return;
     } else {
       _webkitPostMessage_2(this, message, transferList);
       return;
     }
   }
   static void _webkitPostMessage(receiver, message) native;
   static void _webkitPostMessage_2(receiver, message, transferList) native;
 
   String get typeName() { return "DedicatedWorkerContext"; }
 }