Allow the renderer process to map textures from one context into another.

content/renderer/gpu/command_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 CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_
 #define CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
 #include <map>
 #include <queue>
 
 #include "base/callback_old.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/renderer/gpu/gpu_video_decode_accelerator_host.h"
+#include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_message.h"
 
 namespace base {
 class SharedMemory;
 }
 
 namespace gfx {
 class Size;
@@ skipping 29 matching lines @@
   virtual int32 RegisterTransferBuffer(base::SharedMemory* shared_memory,
                                        size_t size,
                                        int32 id_request);
   virtual void DestroyTransferBuffer(int32 id);
   virtual gpu::Buffer GetTransferBuffer(int32 handle);
   virtual void SetToken(int32 token);
   virtual void SetParseError(gpu::error::Error error);
   virtual void SetContextLostReason(gpu::error::ContextLostReason reason);
   virtual void OnSwapBuffers();
 
+  bool MapExternalResource(gpu::resource_type::ResourceType resource_type,
+                           uint32 resource_source_id,
+                           CommandBufferProxy* source_command_buffer,
+                           uint32 resource_dest_id);
+
   // Reparent a command buffer. TODO(apatrick): going forward, the notion of
   // the parent / child relationship between command buffers is going away in
   // favor of the notion of surfaces that can be drawn to in one command buffer
   // and bound as a texture in any other.
   virtual bool SetParent(CommandBufferProxy* parent_command_buffer,
                          uint32 parent_texture_id);
 
   // Set a callback that will be invoked when the SwapBuffers call has been
   // issued.
   void SetSwapBuffersCallback(Callback0::Type* callback);
@@ skipping 55 matching lines @@
 
   scoped_ptr<Callback0::Type> swap_buffers_callback_;
   scoped_ptr<Callback0::Type> channel_error_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxy);
 };
 
 #endif  // ENABLE_GPU
 
 #endif  // CONTENT_RENDERER_GPU_COMMAND_BUFFER_PROXY_H_