gpu: reference target surfaces through a globally unique surface id.

content/browser/renderer_host/gpu_message_filter.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_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 25 matching lines @@
 
  private:
   friend class content::BrowserThread;
   friend class base::DeleteHelper<GpuMessageFilter>;
   virtual ~GpuMessageFilter();
 
   // Message handlers called on the browser IO thread:
   void OnEstablishGpuChannel(content::CauseForGpuLaunch,
                              IPC::Message* reply);
   void OnCreateViewCommandBuffer(
-      int32 render_view_id,
+      int32 surface_id,
       const GPUCreateCommandBufferConfig& init_params,
       IPC::Message* reply);
   // Helper callbacks for the message handlers.
   void EstablishChannelCallback(IPC::Message* reply,
                                 const IPC::ChannelHandle& channel,
                                 base::ProcessHandle gpu_process_for_browser,
                                 const content::GPUInfo& gpu_info);
   void CreateCommandBufferCallback(IPC::Message* reply, int32 route_id);
 
   int gpu_host_id_;
   int render_process_id_;
 
   scoped_refptr<RenderWidgetHelper> render_widget_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMessageFilter);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_