Always use Desktop GL 4.1 or less BindBufferRange behavior.

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 {
@@ skipping 63 matching lines @@
   paused_ = false;
 }
 
 
 TransformFeedbackManager::TransformFeedbackManager(
     GLuint max_transform_feedback_separate_attribs, bool needs_emulation)
     : max_transform_feedback_separate_attribs_(
           max_transform_feedback_separate_attribs),
       needs_emulation_(needs_emulation),
       lost_context_(false) {
+  DCHECK(needs_emulation);
 }
 
 TransformFeedbackManager::~TransformFeedbackManager() {
   DCHECK(transform_feedbacks_.empty());
 }
 
 void TransformFeedbackManager::Destroy() {
   transform_feedbacks_.clear();
 }
 
@@ skipping 17 matching lines @@
 }
 
 void TransformFeedbackManager::RemoveTransformFeedback(GLuint client_id) {
   if (client_id) {
     transform_feedbacks_.erase(client_id);
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu