Don't be so CRASH happy in the bindings layer.

WebCore/bindings/js/WorkerScriptController.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google 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
@@ skipping 144 matching lines @@
     }
 }
 
 void WorkerScriptController::setException(ScriptValue exception)
 {
     throwError(m_workerContextWrapper->globalExec(), exception.jsValue());
 }
 
 void WorkerScriptController::scheduleExecutionTermination()
 {
+    MutexLocker locker(m_scheduledTerminationMutex);
     m_globalData->terminator.terminateSoon();
 }
 
+bool WorkerScriptController::isExecutionTerminating() const
+{
+    MutexLocker locker(m_scheduledTerminationMutex);
+    return m_globalData->terminator.shouldTerminate();
+}
+
 void WorkerScriptController::forbidExecution()
 {
     ASSERT(m_workerContext->isContextThread());
     m_executionForbidden = true;
 }
 
 bool WorkerScriptController::isExecutionForbidden() const
 {
     ASSERT(m_workerContext->isContextThread());
     return m_executionForbidden;
 }
 
 void WorkerScriptController::disableEval()
 {
     initScriptIfNeeded();
     JSLock lock(SilenceAssertionsOnly);
 
     m_workerContextWrapper->setEvalEnabled(false);
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WORKERS)