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 e493e5c3a6f1a360870a79d353623156fb5e3c9d..34af46d1816b2c8b12060c3e6edeb6f6c4c57df9 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 {
@@ -41,7 +42,7 @@ PassRefPtr<SharedWorkerThread> SharedWorkerThread::create(const String& name, Pa
 }
 
 SharedWorkerThread::SharedWorkerThread(const String& name, PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy)
-    : WorkerThread(workerLoaderProxy, workerReportingProxy)
+    : WorkerThread(workerLoaderProxy, workerReportingProxy, WorkerBackingThread::create("SharedWorker Thread"))
     , m_name(name.isolatedCopy())
 {
 }
@@ -55,11 +56,4 @@ PassRefPtrWillBeRawPtr<WorkerGlobalScope> SharedWorkerThread::createWorkerGlobal
     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