Add optimization for CHROMIUM_subscribe_uniform extension.

content/browser/gpu/gpu_process_host_ui_shim.h

Index: content/browser/gpu/gpu_process_host_ui_shim.h
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.h b/content/browser/gpu/gpu_process_host_ui_shim.h
index 9d9ec533e28a536461d08952e346a4271ba2f995..ecd58d7cfba2269d138b743e03084a76dbdec318 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.h
+++ b/content/browser/gpu/gpu_process_host_ui_shim.h
@@ -95,6 +95,8 @@ class GpuProcessHostUIShim : public IPC::Listener,
   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_;