Introduce WorkerBackingThread

third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h

Index: third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h b/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
index 0a64c67aaa5167e0798fd231d82c6236b5addc51..0195d0b161fb3377a6f12730b062556fbfac35b7 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
@@ -7,6 +7,7 @@
 #include "bindings/core/v8/V8GCController.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
+#include "core/workers/WorkerBackingThread.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerReportingProxy.h"
@@ -104,27 +105,13 @@ public:
     WorkerThreadForTest(
         WorkerLoaderProxyProvider* mockWorkerLoaderProxyProvider,
         WorkerReportingProxy& mockWorkerReportingProxy)
-        : WorkerThread(WorkerLoaderProxy::create(mockWorkerLoaderProxyProvider), mockWorkerReportingProxy)
-        , m_thread(WebThreadSupportingGC::create("Test thread"))
+        : WorkerThread(WorkerLoaderProxy::create(mockWorkerLoaderProxyProvider), mockWorkerReportingProxy, WorkerBackingThread::create("Test thread"))
         , m_scriptLoadedEvent(adoptPtr(new WaitableEvent()))
     {
-        ASSERT(m_thread);
     }
 
     ~WorkerThreadForTest() override { }
 
-    // WorkerThread implementation:
-    WebThreadSupportingGC& backingThread() override
-    {
-        ASSERT(m_thread);
-        return *m_thread;
-    }
-    void willDestroyIsolate() override
-    {
-        V8GCController::collectAllGarbageForTesting(v8::Isolate::GetCurrent());
-        WorkerThread::willDestroyIsolate();
-    }
-
     PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData> startupData) override
     {
         return adoptRefWillBeNoop(new FakeWorkerGlobalScope(startupData->m_scriptURL, startupData->m_userAgent, this, startupData->m_starterOriginPrivilegeData.release(), startupData->m_workerClients.release()));
@@ -164,12 +151,11 @@ public:
     void waitForInit()
     {
         OwnPtr<WaitableEvent> completionEvent = adoptPtr(new WaitableEvent());
-        backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WaitableEvent::signal, AllowCrossThreadAccess(completionEvent.get())));
+        workerBackingThread().backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WaitableEvent::signal, AllowCrossThreadAccess(completionEvent.get())));
         completionEvent->wait();
     }
 
 private:
-    OwnPtr<WebThreadSupportingGC> m_thread;
     OwnPtr<WaitableEvent> m_scriptLoadedEvent;
 };