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 b1f6e4ec8e16615537ed0bbc79798d866368c72a..ab541e767c2529e71af81dc1f6be963e347694d4 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 @@ RawPtr<WorkerGlobalScope> DedicatedWorkerThread::createWorkerGlobalScope(PassOwn
     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