Implement initial part of WebEmbeddedWorker

public/web/WebEmbeddedWorker.h

 /*
  * 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 18 matching lines @@
  */
 
 #ifndef WebEmbeddedWorker_h
 #define WebEmbeddedWorker_h
 
 #include "public/platform/WebCommon.h"
 
 namespace blink {
 
 class WebServiceWorkerContextClient;
+class WebWorkerPermissionClientProxy;
 struct WebEmbeddedWorkerStartData;
 
 // An interface to start and terminate an embedded worker.
 // All methods of this class must be called on the main thread.
 class WebEmbeddedWorker {
 public:
     // Invoked on the main thread to instantiate a WebEmbeddedWorker.
     // The given WebWorkerContextClient and WebWorkerPermissionClientProxy are
     // going to be passed on to the worker thread and is held by a newly
     // created WorkerGlobalScope.
     BLINK_EXPORT static WebEmbeddedWorker* create(
         WebServiceWorkerContextClient*,
         WebWorkerPermissionClientProxy*);
 
     virtual ~WebEmbeddedWorker() { }
 
     // Starts and terminates WorkerThread and WorkerGlobalScope.
     virtual void startWorkerContext(const WebEmbeddedWorkerStartData&) = 0;
     virtual void terminateWorkerContext() = 0;
 };
 
 } // namespace blink
 
 #endif // WebEmbeddedWorker_h