Make GL calls go through subclassable class.

gpu/command_buffer/service/program_manager.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/program_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 513 matching lines @@
                                        translator,
                                        feature_info);
           CHECK(info->IsValid());
         }
       }
     }
   }
 
   if (link) {
     before_time = TimeTicks::HighResNow();
-    if (cache && gfx::g_GL_ARB_get_program_binary) {
+    if (cache && gfx::g_driver_gl.ext.b_GL_ARB_get_program_binary) {
       glProgramParameteri(service_id(),
                           PROGRAM_BINARY_RETRIEVABLE_HINT,
                           GL_TRUE);
     }
     glLinkProgram(service_id());
   }
 
   GLint success = 0;
   glGetProgramiv(service_id(), GL_LINK_STATUS, &success);
   if (success == GL_TRUE) {
@@ skipping 602 matching lines @@
     info->ClearUniforms(&zero_);
   }
 }
 
 int32 ProgramManager::MakeFakeLocation(int32 index, int32 element) {
   return index + element * 0x10000;
 }
 
 }  // namespace gles2
 }  // namespace gpu