Add optimization for CHROMIUM_subscribe_uniform extension.

content/browser/gpu/gpu_process_host_ui_shim.h

 // Copyright (c) 2012 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_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
 // portion of this class, the GpuProcessHost, is responsible for
@@ skipping 77 matching lines @@
       const std::string& message);
 
   void OnGraphicsInfoCollected(const gpu::GPUInfo& gpu_info);
 
   void OnAcceleratedSurfaceInitialized(int32 surface_id, int32 route_id);
   void OnAcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params);
   void OnVideoMemoryUsageStatsReceived(
       const GPUVideoMemoryUsageStats& video_memory_usage_stats);
   void OnResourcesRelinquished();
+  void OnAddSubscription(int32 process_id, unsigned int target);
+  void OnRemoveSubscription(int32 process_id, unsigned int target);
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
   base::Closure relinquish_callback_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_