Implement PPAPI VideoDecode out-of-process support

ppapi/proxy/ppb_buffer_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_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"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/thunk/ppb_buffer_api.h"
 
 struct PPB_Buffer_Dev;
 
 namespace pp {
 namespace proxy {
 
 class HostResource;
 
+class Buffer : public ppapi::thunk::PPB_Buffer_API,
+               public PluginResource {
+ public:
+  Buffer(const HostResource& resource,
+         const base::SharedMemoryHandle& shm_handle,
+         uint32_t size);
+  virtual ~Buffer();
+
+  // Resource overrides.
+  virtual Buffer* AsBuffer() OVERRIDE;
+
+  // ResourceObjectBase overrides.
+  virtual ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE;
+
+  // PPB_Buffer_API implementation.
+  virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE;
+  virtual PP_Bool IsMapped() OVERRIDE;
+  virtual void* Map() OVERRIDE;
+  virtual void Unmap() OVERRIDE;
+
+ private:
+  base::SharedMemory shm_;
+  uint32_t size_;
+  void* mapped_data_;
+  int map_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(Buffer);
+};
+
 class PPB_Buffer_Proxy : public InterfaceProxy {
  public:
   PPB_Buffer_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_Buffer_Proxy();
 
   static const Info* GetInfo();
 
   static PP_Resource CreateProxyResource(PP_Instance instance,
                                          uint32_t size);
 
   const PPB_Buffer_Dev* ppb_buffer_target() const {
     return static_cast<const PPB_Buffer_Dev*>(target_interface());
   }
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgCreate(PP_Instance instance,
                    uint32_t size,
                    HostResource* result_resource,
                    base::SharedMemoryHandle* result_shm_handle);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_BUFFER_PROXY_H_