ServiceWorker: Introduce ExtendableMessageEvent to replace MessageEvent

Source/modules/serviceworkers/ServiceWorker.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 
 namespace blink {
 
 const AtomicString& ServiceWorker::interfaceName() const
 {
     return EventTargetNames::ServiceWorker;
 }
 
 void ServiceWorker::postMessage(ExecutionContext* context, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
 {
+    if (m_wasStopped)
+        return;
     // Disentangle the port in preparation for sending it to the remote context.
     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(context, ports, exceptionState);
     if (exceptionState.hadException())
         return;
     if (m_outerWorker->state() == WebServiceWorkerStateRedundant) {
         exceptionState.throwDOMException(InvalidStateError, "ServiceWorker is in redundant state.");
         return;
     }
 
     WebString messageString = message->toWireString();
@@ skipping 85 matching lines @@
 {
     ASSERT(m_outerWorker);
     m_outerWorker->setProxy(this);
 }
 
 ServiceWorker::~ServiceWorker()
 {
 }
 
 } // namespace blink