workers: Move ownership of WebThread from WorkerThread

Source/core/workers/DedicatedWorkerThread.cpp

 /*
  * Copyright (C) 2009 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 26 matching lines @@
 #include "core/workers/WorkerThreadStartupData.h"
 
 namespace blink {
 
 PassRefPtr<DedicatedWorkerThread> DedicatedWorkerThread::create(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerObjectProxy& workerObjectProxy, double timeOrigin, PassOwnPtr<WorkerThreadStartupData> startupData)
 {
     return adoptRef(new DedicatedWorkerThread(workerLoaderProxy, workerObjectProxy, timeOrigin, startupData));
 }
 
 DedicatedWorkerThread::DedicatedWorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerObjectProxy& workerObjectProxy, double timeOrigin, PassOwnPtr<WorkerThreadStartupData> startupData)
-    : WorkerThread("DedicatedWorker Thread", workerLoaderProxy, workerObjectProxy, startupData)
+    : WorkerThread(workerLoaderProxy, workerObjectProxy, startupData)
     , m_workerObjectProxy(workerObjectProxy)
     , m_timeOrigin(timeOrigin)
 {
 }
 
 DedicatedWorkerThread::~DedicatedWorkerThread()
 {
 }
 
 PassRefPtrWillBeRawPtr<WorkerGlobalScope> DedicatedWorkerThread::createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData> startupData)
 {
     return DedicatedWorkerGlobalScope::create(this, startupData, m_timeOrigin);
 }
 
+WebThreadSupportingGC& DedicatedWorkerThread::backingThread()
+{
+    if (!m_thread)
+        m_thread = WebThreadSupportingGC::create("DedicatedWorker Thread");
+    return *m_thread.get();
+}
+
 void DedicatedWorkerThread::postInitialize()
 {
     // Notify the parent object of our current active state before the event
     // loop starts processing tasks.
     m_workerObjectProxy.reportPendingActivity(workerGlobalScope()->hasPendingActivity());
 }
 
 } // namespace blink