Implement GetIntegerv(SAMPLER_BINDING/TRANSFORM_FEEDBACK_BINDING) in command buffer.

gpu/command_buffer/service/transform_feedback_manager.cc

 // Copyright (c) 2016 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.
 
 #include "gpu/command_buffer/service/transform_feedback_manager.h"
 
 #include "gpu/command_buffer/service/buffer_manager.h"
 #include "ui/gl/gl_version_info.h"
 
 namespace gpu {
 namespace gles2 {
 
 TransformFeedback::TransformFeedback(TransformFeedbackManager* manager,
+                                     GLuint client_id,
                                      GLuint service_id)
     : IndexedBufferBindingHost(
           manager->max_transform_feedback_separate_attribs(),
           manager->needs_emulation()),
       manager_(manager),
+      client_id_(client_id),
       service_id_(service_id),
       has_been_bound_(false),
       active_(false),
       paused_(false),
       primitive_mode_(GL_NONE) {
+  DCHECK_LE(0u, client_id);
   DCHECK_LT(0u, service_id);
 }
 
 TransformFeedback::~TransformFeedback() {
   if (!manager_->lost_context()) {
     if (active_)
       glEndTransformFeedback();
     glDeleteTransformFeedbacks(1, &service_id_);
   }
 }
@@ skipping 54 matching lines @@
   DCHECK(transform_feedbacks_.empty());
 }
 
 void TransformFeedbackManager::Destroy() {
   transform_feedbacks_.clear();
 }
 
 TransformFeedback* TransformFeedbackManager::CreateTransformFeedback(
     GLuint client_id, GLuint service_id) {
   scoped_refptr<TransformFeedback> transform_feedback(
-      new TransformFeedback(this, service_id));
+      new TransformFeedback(this, client_id, service_id));
   auto result = transform_feedbacks_.insert(
       std::make_pair(client_id, transform_feedback));
   DCHECK(result.second);
   return result.first->second.get();
 }
 
 TransformFeedback* TransformFeedbackManager::GetTransformFeedback(
     GLuint client_id) {
   if (client_id == 0) {
     return nullptr;
   }
   auto it = transform_feedbacks_.find(client_id);
   return it != transform_feedbacks_.end() ? it->second.get() : nullptr;
 }
 
 void TransformFeedbackManager::RemoveTransformFeedback(GLuint client_id) {
   if (client_id) {
     transform_feedbacks_.erase(client_id);
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu