Introduce WorkerBackingThread

third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp

Index: third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp b/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
index 2681732decfdd79c0658148f7f4abdf05ef8b0ea..bc45783177a326c10013b99cfaa82689f972b7b3 100644
--- a/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
@@ -31,6 +31,7 @@
 #include "core/workers/DedicatedWorkerThread.h"
 
 #include "core/workers/DedicatedWorkerGlobalScope.h"
+#include "core/workers/WorkerBackingThread.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
 
@@ -43,6 +44,7 @@ PassOwnPtr<DedicatedWorkerThread> DedicatedWorkerThread::create(PassRefPtr<Worke
 
 DedicatedWorkerThread::DedicatedWorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerObjectProxy& workerObjectProxy, double timeOrigin)
     : WorkerThread(workerLoaderProxy, workerObjectProxy)
+    , m_workerBackingThread(WorkerBackingThread::create("DedicatedWorker Thread"))
     , m_workerObjectProxy(workerObjectProxy)
     , m_timeOrigin(timeOrigin)
 {
@@ -57,13 +59,6 @@ WorkerGlobalScope* DedicatedWorkerThread::createWorkerGlobalScope(PassOwnPtr<Wor
     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