Implement GetIntegerv(SAMPLER_BINDING/TRANSFORM_FEEDBACK_BINDING) in command buffer.

gpu/command_buffer/service/transform_feedback_manager.h

Index: gpu/command_buffer/service/transform_feedback_manager.h
diff --git a/gpu/command_buffer/service/transform_feedback_manager.h b/gpu/command_buffer/service/transform_feedback_manager.h
index 17b3507ebe31770b4f935db23e61e46fc8344c3b..edb52270b51ede9c086458765c35613808a8d6ec 100644
--- a/gpu/command_buffer/service/transform_feedback_manager.h
+++ b/gpu/command_buffer/service/transform_feedback_manager.h
@@ -22,7 +22,8 @@ class TransformFeedbackManager;
 // Info about TransformFeedbacks currently in the system.
 class GPU_EXPORT TransformFeedback : public IndexedBufferBindingHost {
  public:
-  TransformFeedback(TransformFeedbackManager* manager, GLuint service_id);
+  TransformFeedback(
+      TransformFeedbackManager* manager, GLuint client_id, GLuint service_id);
 
   // All the following functions do state update and call the underlying GL
   // function.  All validations have been done already and the GL function is
@@ -33,6 +34,10 @@ class GPU_EXPORT TransformFeedback : public IndexedBufferBindingHost {
   void DoPauseTransformFeedback();
   void DoResumeTransformFeedback();
 
+  GLuint client_id() const {
+    return client_id_;
+  }
+
   GLuint service_id() const {
     return service_id_;
   }
@@ -59,6 +64,7 @@ class GPU_EXPORT TransformFeedback : public IndexedBufferBindingHost {
   // The manager that owns this Buffer.
   TransformFeedbackManager* manager_;
 
+  GLuint client_id_;
   GLuint service_id_;
 
   bool has_been_bound_;