Implement out-of-process proxy for PPB_Buffer_Dev.

ppapi/proxy/ppb_buffer_proxy.h

 // Copyright (c) 2010 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_PPB_BUFFER_PROXY_H_
 #define PPAPI_PPB_BUFFER_PROXY_H_
 
+#include "base/shared_memory.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_Buffer_Dev;
 
 namespace pp {
 namespace proxy {
 
 class HostResource;
 
@@ skipping 12 matching lines @@
   }
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgCreate(PP_Instance instance,
                    uint32_t size,
                    HostResource* result_resource,
-                   int* result_shm_handle);
+                   base::SharedMemoryHandle* result_shm_handle);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_BUFFER_PROXY_H_