Introduce WebTaskRunner Patch 3/5

Source/modules/compositorworker/CompositorWorkerManager.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/compositorworker/CompositorWorkerManager.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8Initializer.h"
@@ skipping 89 matching lines @@
 
 void CompositorWorkerManager::shutdownBackingThread()
 {
     MutexLocker lock(m_mutex);
     ASSERT(m_thread->isCurrentThread());
     ASSERT(m_workerCount > 0);
     --m_workerCount;
     if (m_workerCount == 0) {
         m_thread->shutdown();
         m_thread = nullptr;
-        Platform::current()->mainThread()->postTask(FROM_HERE, threadSafeBind(destroyThread, AllowCrossThreadAccess(m_platformThread.leakPtr())));
+        Platform::current()->mainThread()->taskRunner()->postTask(FROM_HERE, threadSafeBind(destroyThread, AllowCrossThreadAccess(m_platformThread.leakPtr())));
     }
 }
 
 v8::Isolate* CompositorWorkerManager::initializeIsolate()
 {
     MutexLocker lock(m_mutex);
     ASSERT(m_thread->isCurrentThread());
     ASSERT(m_isolate);
     // It is safe to use the existing isolate even if TerminateExecution() has been
     // called on it, without calling CancelTerminateExecution().
@@ skipping 22 matching lines @@
 {
     MutexLocker lock(m_mutex);
     ASSERT(isMainThread());
     if (m_workerCount > 1)
         return;
 
     v8::V8::TerminateExecution(m_isolate);
 }
 
 } // namespace blink