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 30e30a1d75f2f9687a4ca3240c9431fee1966026..7cb2e010a191f9197daf5f31d2a15cc45e98d774 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"
 
@@ -42,7 +43,7 @@ PassRefPtr<DedicatedWorkerThread> DedicatedWorkerThread::create(PassRefPtr<Worke
 }
 
 DedicatedWorkerThread::DedicatedWorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerObjectProxy& workerObjectProxy, double timeOrigin)
-    : WorkerThread(workerLoaderProxy, workerObjectProxy)
+    : WorkerThread(workerLoaderProxy, workerObjectProxy, WorkerBackingThread::create("DedicatedWorker Thread"))
     , m_workerObjectProxy(workerObjectProxy)
     , m_timeOrigin(timeOrigin)
 {
@@ -57,13 +58,6 @@ PassRefPtrWillBeRawPtr<WorkerGlobalScope> DedicatedWorkerThread::createWorkerGlo
     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