Expose GL_VENDOR/GL_RENDERER strings to internal clients of GPU command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 12353 matching lines @@
 
   const char* str = nullptr;
   std::string extensions;
   switch (name) {
     case GL_VERSION:
       str = GetServiceVersionString(feature_info_.get());
       break;
     case GL_SHADING_LANGUAGE_VERSION:
       str = GetServiceShadingLanguageVersionString(feature_info_.get());
       break;
-    case GL_RENDERER:

[Zhenyao Mo, 2017/03/20 18:27:56]

Note we remove the special handling, and they just default to the glGetString()
below.

-      str = GetServiceRendererString(feature_info_.get());
-      break;
-    case GL_VENDOR:
-      str = GetServiceVendorString(feature_info_.get());
-      break;
-      break;
     case GL_EXTENSIONS:
       {
         // For WebGL contexts, strip out shader extensions if they have not
         // been enabled on WebGL1 or no longer exist (become core) in WebGL2.
         if (feature_info_->IsWebGLContext()) {
           extensions = feature_info_->extensions();
           if (!derivatives_explicitly_enabled_) {
             size_t offset = extensions.find(kOESDerivativeExtension);
             if (std::string::npos != offset) {
               extensions.replace(offset, arraysize(kOESDerivativeExtension),
@@ skipping 6998 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu