Improve indexed gl state related GL commands.

gpu/command_buffer/service/context_state.h

Index: gpu/command_buffer/service/context_state.h
diff --git a/gpu/command_buffer/service/context_state.h b/gpu/command_buffer/service/context_state.h
index 3a44730c40b37e49128c4a1692aac8dc3052fc90..ffd38d2a47a1359c4caed13191c75e9de89aabdf 100644
--- a/gpu/command_buffer/service/context_state.h
+++ b/gpu/command_buffer/service/context_state.h
@@ -26,6 +26,7 @@ class ErrorState;
 class ErrorStateClient;
 class FeatureInfo;
 class Framebuffer;
+class IndexedBufferBindingHost;
 class Logger;
 class Program;
 class Renderbuffer;
@@ -190,6 +191,7 @@ struct GPU_EXPORT ContextState {
   void RestoreProgramBindings() const;
   void RestoreRenderbufferBindings();
   void RestoreTransformFeedbackBindings(const ContextState* prev_state);
+  void RestoreIndexedUniformBufferBindings(const ContextState* prev_state);
   void RestoreTextureUnitBindings(
       GLuint unit, const ContextState* prev_state) const;
 
@@ -283,6 +285,8 @@ struct GPU_EXPORT ContextState {
 
   scoped_refptr<TransformFeedback> bound_transform_feedback;
 
+  scoped_refptr<IndexedBufferBindingHost> indexed_uniform_buffer_bindings;
+
   // The values for each attrib.
   std::vector<Vec4> attrib_values;