Add a unified resource tracker shared between the proxy and the impl.

ppapi/proxy/ppp_graphics_3d_proxy.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_PROXY_PPP_GRAPHICS_3D_PROXY_H_
 #define PPAPI_PROXY_PPP_GRAPHICS_3D_PROXY_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/shared_impl/host_resource.h"
 
 struct PPP_Graphics3D_Dev;
 
 namespace pp {
 namespace proxy {
 
 class PPP_Graphics3D_Proxy : public InterfaceProxy {
  public:
   PPP_Graphics3D_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPP_Graphics3D_Proxy();
 
   static const Info* GetInfo();
 
   const PPP_Graphics3D_Dev* ppp_graphics_3d_target() const {
     return reinterpret_cast<const PPP_Graphics3D_Dev*>(target_interface());
   }
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgContextLost(PP_Instance instance);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_PPP_GRAPHICS_3D_PROXY_H_