Make GL calls go through subclassable class.

gpu/command_buffer/service/program_manager_unittest.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 "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
@@ skipping 1269 matching lines @@
                                                 0,
                                                 service_program_id);
   }
 
   void SetExpectationsForProgramLink() {
     SetExpectationsForProgramLink(kServiceProgramId);
   }
 
   void SetExpectationsForProgramLink(GLuint service_program_id) {
     TestHelper::SetupShader(gl_.get(), NULL, 0, NULL, 0, service_program_id);
-    if (gfx::g_GL_ARB_get_program_binary) {
+    if (gfx::g_driver_gl.ext.b_GL_ARB_get_program_binary) {
       EXPECT_CALL(*gl_.get(),
                   ProgramParameteri(service_program_id,
                                     PROGRAM_BINARY_RETRIEVABLE_HINT,
                                     GL_TRUE)).Times(1);
     }
   }
 
   void SetExpectationsForSuccessCompile(
       const ShaderManager::ShaderInfo* shader) {
     const GLuint shader_id = shader->service_id();
@@ skipping 218 matching lines @@
   SetExpectationsForProgramCached(program_info,
                                   new_vertex_shader,
                                   fragment_shader_);
   SetExpectationsForProgramLink(kNewProgramServiceId);
 
   EXPECT_TRUE(program_info->Link(&shader_manager_, NULL, NULL, info.get()));
 }
 
 }  // namespace gles2
 }  // namespace gpu