Fix data race in blink::WorkerMessagingProxy::reportException

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 303 matching lines @@
     SafePointScope safePointScope(ThreadState::HeapPointersOnStack);
     terminateInternal();
 }
 
 void WorkerThread::terminateAndWait()
 {
     terminate();
     m_terminationEvent->wait();
 }
 
+WorkerGlobalScope* WorkerThread::workerGlobalScope()
+{
+    ASSERT(isCurrentThread());
+    return m_workerGlobalScope.get();
+}
+
 bool WorkerThread::terminated()
 {
     MutexLocker lock(m_threadStateMutex);
     return m_terminated;
 }
 
 void WorkerThread::terminateInternal()
 {
     ASSERT(isMainThread());
 
@@ skipping 177 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink