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

WebCore/bindings/v8/WorkerScriptController.h

 /*
- * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
@@ skipping 46 matching lines @@
         void evaluate(const ScriptSourceCode&, ScriptValue* exception);
 
         void setException(ScriptValue);
 
         // Async request to terminate a future JS execution. Eventually causes termination
         // exception raised during JS execution, if the worker thread happens to run JS.
         // After JS execution was terminated in this way, the Worker thread has to use
         // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
         // Can be called from any thread.
         void scheduleExecutionTermination();
+        bool isExecutionTerminating() const;
 
         // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
         // or by Worker thread termination code to prevent future entry into JS.
         void forbidExecution();
         bool isExecutionForbidden() const;
 
         void disableEval();
 
         // Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context.
         static WorkerScriptController* controllerForContext();
 
     private:
         WorkerContext* m_workerContext;
         OwnPtr<WorkerContextExecutionProxy> m_proxy;
         v8::Isolate* m_isolate;
         ScopedDOMDataStore m_DOMDataStore;
         bool m_executionForbidden;
+        bool m_executionScheduledToTerminate;
+        mutable Mutex m_scheduledTerminationMutex;
     };
 
 } // namespace WebCore
 
 #endif // ENABLE(WORKERS)
 
 #endif // WorkerScriptController_h