Support multiple HW video decoders per context.

content/renderer/gpu/gpu_channel_host.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_GPU_CHANNEL_HOST_H_
 #define CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 84 matching lines @@
   // Create a surface in the GPU process. Returns null on failure.
   GpuSurfaceProxy* CreateOffscreenSurface(const gfx::Size& size);
 
   // Destroy a surface in the GPU process.
   void DestroySurface(GpuSurfaceProxy* surface);
 
   TransportTextureService* transport_texture_service() {
     return transport_texture_service_.get();
   }
 
+  // Called to add/remove a listener for a particular message routing ID.
+  void AddRoute(int32 route_id, IPC::Channel::Listener* listener);
+  void RemoveRoute(int32 route_id);
+
  private:
   State state_;
 
   GPUInfo gpu_info_;
 
   scoped_ptr<IPC::SyncChannel> channel_;
 
   // Used to implement message routing functionality to CommandBufferProxy
   // objects
   MessageRouter router_;
 
   // Keep track of all the registered CommandBufferProxies to
   // inform about OnChannelError
   typedef base::hash_map<int, CommandBufferProxy*> ProxyMap;
   ProxyMap proxies_;
 
   // This is a MessageFilter to intercept IPC messages related to transport
   // textures. These messages are routed to TransportTextureHost.
   scoped_refptr<TransportTextureService> transport_texture_service_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 #endif  // CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_