Move workers to Chromium threading

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 240 matching lines @@
     if (m_workerContext) {
         m_workerContext->script()->scheduleExecutionTermination();
 
         DatabaseManager::manager().interruptAllDatabasesForContext(m_workerContext.get());
         m_runLoop.postTaskAndTerminate(WorkerThreadShutdownStartTask::create());
         return;
     }
     m_runLoop.terminate();
 }
 
+bool WorkerThread::isCurrentThread() const
+{
+    return m_threadID == currentThread();
+}
+
 class ReleaseFastMallocFreeMemoryTask : public ScriptExecutionContext::Task {
     virtual void performTask(ScriptExecutionContext*) OVERRIDE { WTF::releaseFastMallocFreeMemory(); }
 };
 
 void WorkerThread::releaseFastMallocFreeMemoryInAllThreads()
 {
     MutexLocker lock(threadSetMutex());
     HashSet<WorkerThread*>& threads = workerThreads();
     HashSet<WorkerThread*>::iterator end = threads.end();
     for (HashSet<WorkerThread*>::iterator it = threads.begin(); it != end; ++it)
         (*it)->runLoop().postTask(adoptPtr(new ReleaseFastMallocFreeMemoryTask));
 }
 
 } // namespace WebCore