Refactor GL bindings so there is no global GLApi or DriverGL.

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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 2173 matching lines @@
         nullptr, 0, service_program_id);
   }
 
   void SetExpectationsForProgramLink() {
     SetExpectationsForProgramLink(kServiceProgramId);
   }
 
   void SetExpectationsForProgramLink(GLuint service_program_id) {
     TestHelper::SetupShaderExpectations(gl_.get(), feature_info_.get(), nullptr,
                                         0, nullptr, 0, service_program_id);
-    if (gl::g_driver_gl.ext.b_GL_ARB_get_program_binary) {
+    if (gl::g_current_gl_driver->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 Shader* shader) {
     const GLuint shader_id = shader->service_id();
@@ skipping 308 matching lines @@
     ProgramManagerDualSourceBlendingES2Test,
     testing::Values(
         make_gl_ext_tuple("3.2",
                           "GL_ARB_draw_buffers GL_ARB_blend_func_extended "
                           "GL_ARB_program_interface_query"),
         make_gl_ext_tuple("opengl es 3.1",
                           "GL_EXT_draw_buffers GL_EXT_blend_func_extended")));
 
 }  // namespace gles2
 }  // namespace gpu