Add optimization for CHROMIUM_subscribe_uniform extension.

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index b6b64830803d1ea2808a9f599bf9e4888ce07a53..9bf87dabf8565ed828d5f49232296b16e9d0649a 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -35,6 +35,7 @@ class RenderbufferManager;
 class ProgramManager;
 class ShaderManager;
 class TextureManager;
+class SubscriptionRefSet;
 class ValuebufferManager;
 class MemoryTracker;
 struct DisallowedFeatures;
@@ -48,6 +49,7 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
       const scoped_refptr<MemoryTracker>& memory_tracker,
       const scoped_refptr<ShaderTranslatorCache>& shader_translator_cache,
       const scoped_refptr<FeatureInfo>& feature_info,
+      const scoped_refptr<SubscriptionRefSet>& subscription_ref_set,
       const scoped_refptr<ValueStateMap>& pending_valuebuffer_state,
       bool bind_generates_resource);
 
@@ -188,7 +190,8 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
   scoped_refptr<MemoryTracker> memory_tracker_;
   scoped_refptr<ShaderTranslatorCache> shader_translator_cache_;
   scoped_ptr<TransferBufferManagerInterface> transfer_buffer_manager_;
-  scoped_refptr<gpu::ValueStateMap> pending_valuebuffer_state_;
+  scoped_refptr<SubscriptionRefSet> subscription_ref_set_;
+  scoped_refptr<ValueStateMap> pending_valuebuffer_state_;
 
   bool enforce_gl_minimums_;
   bool bind_generates_resource_;