Oilpan: Prpare to move WorkerEventQueue to Oilpan heap.

Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 191 matching lines @@
 void WorkerGlobalScope::wasRequestedToTerminate()
 {
     if (m_terminationObserver)
         m_terminationObserver->wasRequestedToTerminate();
 }
 
 void WorkerGlobalScope::dispose()
 {
     ASSERT(thread()->isCurrentThread());
 
+    m_eventQueue->close();
     clearScript();
     clearInspector();
     setClient(0);
 
     // We do not clear the thread field of the
     // WorkerGlobalScope. Other objects keep the worker global scope
     // alive because they need its thread field to check that work is
     // being carried out on the right thread. We therefore cannot clear
     // the thread field before all references to the worker global
     // scope are gone.
@@ skipping 96 matching lines @@
 WorkerEventQueue* WorkerGlobalScope::eventQueue() const
 {
     return m_eventQueue.get();
 }
 
 void WorkerGlobalScope::trace(Visitor* visitor)
 {
     visitor->trace(m_console);
     visitor->trace(m_location);
     visitor->trace(m_navigator);
+    visitor->trace(m_eventQueue);
     visitor->trace(m_workerClients);
     WillBeHeapSupplementable<WorkerGlobalScope>::trace(visitor);
     ExecutionContext::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore