The "push" event should inherit from ExtendableEvent.

Source/web/ServiceWorkerGlobalScopeProxy.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 122 matching lines @@
     WaitUntilObserver* observer = WaitUntilObserver::create(m_workerGlobalScope, WaitUntilObserver::NotificationError, eventID);
     // FIXME: Initialize a Notification object based on |data|.
     NotificationEventInit eventInit;
     RefPtrWillBeRawPtr<Event> event(NotificationEvent::create(EventTypeNames::notificationerror, eventInit, observer));
     m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
 }
 
 void ServiceWorkerGlobalScopeProxy::dispatchPushEvent(int eventID, const WebString& data)
 {
     ASSERT(m_workerGlobalScope);
-    m_workerGlobalScope->dispatchEvent(PushEvent::create(EventTypeNames::push, data));
-    // TODO(mvanouwerkerk): Instead of calling didHandlePushEvent here, it
-    // should get called from WaitUntilObserver::decrementPendingActivity once
-    // the push event is hooked up to event.waitUntil (crbug.com/430888).
-    ServiceWorkerGlobalScopeClient::from(m_workerGlobalScope)->didHandlePushEvent(eventID, WebServiceWorkerEventResultCompleted);
+    WaitUntilObserver* observer = WaitUntilObserver::create(m_workerGlobalScope, WaitUntilObserver::Push, eventID);
+    RefPtrWillBeRawPtr<Event> event(PushEvent::create(EventTypeNames::push, data, observer));
+    m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
 }
 
 void ServiceWorkerGlobalScopeProxy::dispatchSyncEvent(int eventID)
 {
     ASSERT(m_workerGlobalScope);
     if (RuntimeEnabledFeatures::backgroundSyncEnabled())
         m_workerGlobalScope->dispatchEvent(Event::create(EventTypeNames::sync));
     ServiceWorkerGlobalScopeClient::from(m_workerGlobalScope)->didHandleSyncEvent(eventID);
 }
 
@@ skipping 42 matching lines @@
 
 ServiceWorkerGlobalScopeProxy::ServiceWorkerGlobalScopeProxy(WebEmbeddedWorkerImpl& embeddedWorker, Document& document, WebServiceWorkerContextClient& client)
     : m_embeddedWorker(embeddedWorker)
     , m_document(document)
     , m_client(client)
     , m_workerGlobalScope(0)
 {
 }
 
 } // namespace blink