Implement initial part of WebEmbeddedWorker

Source/core/workers/WorkerScriptLoader.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 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 153 matching lines @@
 {
     notifyError();
 }
 
 void WorkerScriptLoader::notifyError()
 {
     m_failed = true;
     notifyFinished();
 }
 
+void WorkerScriptLoader::cancel()
+{
+    if (m_threadableLoader)
+        m_threadableLoader->cancel();
+}
+
 String WorkerScriptLoader::script()
 {
     return m_script.toString();
 }
 
 void WorkerScriptLoader::notifyFinished()
 {
     if (!m_client || m_finishing)
         return;
 
     m_finishing = true;
     m_client->notifyFinished();
 }
 
 } // namespace WebCore