Allow sites to enable 'window.onerror' handlers for cross-domain scripts.

Source/core/workers/WorkerMessagingProxy.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 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 123 matching lines @@
         Worker* workerObject = m_messagingProxy->workerObject();
         if (!workerObject)
             return;
 
         // We don't bother checking the askedToTerminate() flag here, because exceptions should *always* be reported even if the thread is terminated.
         // This is intentionally different than the behavior in MessageWorkerTask, because terminated workers no longer deliver messages (section 4.6 of the WebWorker spec), but they do report exceptions.
 
         RefPtr<ErrorEvent> event = ErrorEvent::create(m_errorMessage, m_sourceURL, m_lineNumber, m_columnNumber);
         bool errorHandled = !workerObject->dispatchEvent(event);
         if (!errorHandled)
-            context->reportException(event, 0);
+            context->reportException(event, 0, NotSharableCrossOrigin);
     }
 
     String m_errorMessage;
     int m_lineNumber;
     int m_columnNumber;
     String m_sourceURL;
     WorkerMessagingProxy* m_messagingProxy;
 };
 
 class WorkerGlobalScopeDestroyedTask : public ScriptExecutionContext::Task {
@@ skipping 317 matching lines @@
 
     m_workerThreadHadPendingActivity = hasPendingActivity;
 }
 
 bool WorkerMessagingProxy::hasPendingActivity() const
 {
     return (m_unconfirmedMessageCount || m_workerThreadHadPendingActivity) && !m_askedToTerminate;
 }
 
 } // namespace WebCore