Introduce WorkerBackingThread

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

Index: third_party/WebKit/Source/core/workers/SharedWorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/SharedWorkerThread.cpp b/third_party/WebKit/Source/core/workers/SharedWorkerThread.cpp
index 69a0d2b760f9befe0d0ef74f6f94674c8f289bdd..e4c062cf864fe55bba8c0500a9e1d05b7fae8e22 100644
--- a/third_party/WebKit/Source/core/workers/SharedWorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/SharedWorkerThread.cpp
@@ -31,6 +31,7 @@
 #include "core/workers/SharedWorkerThread.h"
 
 #include "core/workers/SharedWorkerGlobalScope.h"
+#include "core/workers/WorkerBackingThread.h"
 #include "core/workers/WorkerThreadStartupData.h"
 
 namespace blink {
@@ -42,6 +43,7 @@ PassOwnPtr<SharedWorkerThread> SharedWorkerThread::create(const String& name, Pa
 
 SharedWorkerThread::SharedWorkerThread(const String& name, PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy)
     : WorkerThread(workerLoaderProxy, workerReportingProxy)
+    , m_workerBackingThread(WorkerBackingThread::create("SharedWorker Thread"))
     , m_name(name.isolatedCopy())
 {
 }
@@ -55,11 +57,4 @@ WorkerGlobalScope* SharedWorkerThread::createWorkerGlobalScope(PassOwnPtr<Worker
     return SharedWorkerGlobalScope::create(m_name, this, startupData);
 }
 
-WebThreadSupportingGC& SharedWorkerThread::backingThread()
-{
-    if (!m_thread)
-        m_thread = WebThreadSupportingGC::create("SharedWorker Thread");
-    return *m_thread.get();
-}
-
 } // namespace blink