[NOT READY FOR REVIEW YET]workers: Some refactoring to allow creating new kind of worker threads

Source/core/workers/WorkerThread.cpp

 /*
  * 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 230 matching lines @@
     WorkerThread* m_thread;
 };
 
 WorkerThread::WorkerThread(WorkerLoaderProxy& workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData> startupData)
     : m_terminated(false)
     , m_workerLoaderProxy(workerLoaderProxy)
     , m_workerReportingProxy(workerReportingProxy)
     , m_startupData(startupData)
     , m_shutdownEvent(adoptPtr(blink::Platform::current()->createWaitableEvent()))
     , m_terminationEvent(adoptPtr(blink::Platform::current()->createWaitableEvent()))
+    , m_isolate(nullptr)
 {
     MutexLocker lock(threadSetMutex());
     workerThreads().add(this);
 }
 
 WorkerThread::~WorkerThread()
 {
     MutexLocker lock(threadSetMutex());
     ASSERT(workerThreads().contains(this));
     workerThreads().remove(this);
 }
 
 void WorkerThread::start()
 {
     if (m_thread)
         return;
 
-    m_thread = WebThreadSupportingGC::create("WebCore: Worker");
+    m_thread = createWebThreadSupportingGC();
     m_thread->postTask(new Task(WTF::bind(&WorkerThread::initialize, this)));
 }
 
 void WorkerThread::interruptAndDispatchInspectorCommands()
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     if (m_workerInspectorController)
         m_workerInspectorController->interruptAndDispatchInspectorCommands();
 }
 
 PlatformThreadId WorkerThread::platformThreadId() const
 {
     if (!m_thread)
         return 0;
     return m_thread->platformThread().threadId();
 }
 
+v8::Isolate* WorkerThread::isolate() const
+{
+    ASSERT(isCurrentThread());
+    return m_isolate;
+}
+
 void WorkerThread::initialize()
 {
     KURL scriptURL = m_startupData->m_scriptURL;
     String sourceCode = m_startupData->m_sourceCode;
     WorkerThreadStartMode startMode = m_startupData->m_startMode;
 
     {
         MutexLocker lock(m_threadCreationMutex);
 
         // The worker was terminated before the thread had a chance to run.
         if (m_terminated) {
             // Notify the proxy that the WorkerGlobalScope has been disposed of.
             // This can free this thread object, hence it must not be touched afterwards.
             m_workerReportingProxy.workerThreadTerminated();
             return;
         }
 
         m_microtaskRunner = adoptPtr(new MicrotaskRunner);
         m_thread->addTaskObserver(m_microtaskRunner.get());
         m_thread->attachGC();
+
+        m_isolate = initializeIsolate();
+
         m_workerGlobalScope = createWorkerGlobalScope(m_startupData.release());
 
         m_sharedTimer = adoptPtr(new WorkerSharedTimer(this));
         PlatformThreadData::current().threadTimers().setSharedTimer(m_sharedTimer.get());
     }
 
     // The corresponding call to didStopWorkerRunLoop is in
     // ~WorkerScriptController.
     blink::Platform::current()->didStartWorkerRunLoop(blink::WebWorkerRunLoop(this));
 
     // Notify proxy that a new WorkerGlobalScope has been created and started.
     m_workerReportingProxy.workerGlobalScopeStarted(m_workerGlobalScope.get());
 
     WorkerScriptController* script = m_workerGlobalScope->script();
     if (!script->isExecutionForbidden())
         script->initializeContextIfNeeded();
     InspectorInstrumentation::willEvaluateWorkerScript(workerGlobalScope(), startMode);
     bool success = script->evaluate(ScriptSourceCode(sourceCode, scriptURL));
     m_workerGlobalScope->didEvaluateWorkerScript();
     m_workerReportingProxy.didEvaluateWorkerScript(success);
 
     postInitialize();
 
     postDelayedTask(createSameThreadTask(&WorkerThread::idleHandler, this), kShortIdleHandlerDelayMs);
 }
 
+v8::Isolate* WorkerThread::initializeIsolate()
+{
+    ASSERT(isCurrentThread());
+    v8::Isolate* isolate = V8PerIsolateData::initialize();
+    V8Initializer::initializeWorker(isolate);
+    return isolate;
+}
+
+PassOwnPtr<WebThreadSupportingGC> WorkerThread::createWebThreadSupportingGC()
+{
+    return WebThreadSupportingGC::create("WebCore: Worker");
+}
+
 void WorkerThread::cleanup()
 {
 
     // This should be called before we start the shutdown procedure.
     workerReportingProxy().willDestroyWorkerGlobalScope();
 
     // The below assignment will destroy the context, which will in turn notify messaging proxy.
     // We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
     // If Oilpan is enabled, we detach of the context/global scope, with the final heap cleanup below sweeping it out.
 #if !ENABLE(OILPAN)
@@ skipping 190 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink