compositor-worker: Introduce CompositorWorker.

Source/core/workers/WorkerThread.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 46 matching lines @@
     PauseWorkerGlobalScopeOnStart
 };
 
 class WorkerThread : public RefCounted<WorkerThread> {
 public:
     virtual ~WorkerThread();
 
     virtual void start();
     virtual void stop();
 
-    void didStartRunLoop();
-    void didStopRunLoop();
+    virtual PassOwnPtr<WebThreadSupportingGC> createWebThreadSupportingGC();
+    virtual void didStartRunLoop();
+    virtual void didStopRunLoop();
 
     v8::Isolate* isolate() const { return m_isolate; }
 
     // Can be used to wait for this worker thread to shut down.
     // (This is signalled on the main thread, so it's assumed to be waited on the worker context thread)
     WebWaitableEvent* shutdownEvent() { return m_shutdownEvent.get(); }
 
     WebWaitableEvent* terminationEvent() { return m_terminationEvent.get(); }
     void terminateAndWait();
     static void terminateAndWaitForAllWorkers();
@@ skipping 30 matching lines @@
     void setWorkerInspectorController(WorkerInspectorController*);
 
 protected:
     WorkerThread(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>);
 
     // Factory method for creating a new worker context for the thread.
     virtual PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>) = 0;
 
     virtual void postInitialize() { }
 
+    virtual v8::Isolate* initializeIsolate();
+    virtual void willDestroyIsolate();
+    virtual void destroyIsolate();
+    virtual void terminateV8Execution();
+
 private:
     friend class WorkerSharedTimer;
     friend class WorkerThreadShutdownFinishTask;
 
     void stopInShutdownSequence();
     void stopInternal();
 
     void initialize();
     void cleanup();
     void idleHandler();
     void postDelayedTask(PassOwnPtr<ExecutionContextTask>, long long delayMs);
     void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>, long long delayMs);
 
-    v8::Isolate* initializeIsolate();
-    void willDestroyIsolate();
-    void destroyIsolate();
-    void terminateV8Execution();
-
     bool m_terminated;
     OwnPtr<WorkerSharedTimer> m_sharedTimer;
     MessageQueue<WorkerThreadTask> m_debuggerMessageQueue;
     OwnPtr<WebThread::TaskObserver> m_microtaskRunner;
 
     RefPtr<WorkerLoaderProxy> m_workerLoaderProxy;
     WorkerReportingProxy& m_workerReportingProxy;
 
     RefPtrWillBePersistent<WorkerInspectorController> m_workerInspectorController;
     Mutex m_workerInspectorControllerMutex;
@@ skipping 15 matching lines @@
     // WorkerThread might get deleted before it had a chance to properly
     // shut down. By deleting the WebThread first, we can guarantee that
     // no pending tasks on the thread might want to access any of the other
     // members during the WorkerThread's destruction.
     OwnPtr<WebThreadSupportingGC> m_thread;
 };
 
 } // namespace blink
 
 #endif // WorkerThread_h