Report V8 execution termination in a worker as an error.

Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp

 /*
  * Copyright (C) 2013 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
@@ skipping 174 matching lines @@
     return result;
 }
 
 void ServiceWorkerGlobalScope::dispatchExtendableEvent(PassRefPtrWillBeRawPtr<Event> event, WaitUntilObserver* observer)
 {
     ASSERT(m_eventNestingLevel == 0);
     m_hadErrorInTopLevelEventHandler = false;
 
     observer->willDispatchEvent();
     dispatchEvent(event);
+    if (thread()->terminated())
+        m_hadErrorInTopLevelEventHandler = true;
     observer->didDispatchEvent(m_hadErrorInTopLevelEventHandler);
 }
 
 DEFINE_TRACE(ServiceWorkerGlobalScope)
 {
     visitor->trace(m_clients);
     visitor->trace(m_registration);
     visitor->trace(m_caches);
     WorkerGlobalScope::trace(visitor);
 }
@@ skipping 16 matching lines @@
 void ServiceWorkerGlobalScope::logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack> callStack)
 {
     WorkerGlobalScope::logExceptionToConsole(errorMessage, scriptId, sourceURL, lineNumber, columnNumber, callStack);
     RefPtrWillBeRawPtr<ConsoleMessage> consoleMessage = ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, errorMessage, sourceURL, lineNumber);
     consoleMessage->setScriptId(scriptId);
     consoleMessage->setCallStack(callStack);
     addMessageToWorkerConsole(consoleMessage.release());
 }
 
 } // namespace blink