Support dynamic switching between integrated and discrete GPUs on Mac OS X.

ui/gfx/gl/gl_context_stub.cc

 // Copyright (c) 2011 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 "ui/gfx/gl/gl_context_stub.h"
 
 namespace gfx {
 
 GLContextStub::GLContextStub() : GLContext(NULL) {
 }
 
 GLContextStub::~GLContextStub() {
 }
 
-bool GLContextStub::Initialize(GLSurface* compatible_surface) {
+bool GLContextStub::Initialize(
+    GLSurface* compatible_surface, GpuPreference gpu_preference) {
   return true;
 }
 
 void GLContextStub::Destroy() {
 }
 
 bool GLContextStub::MakeCurrent(GLSurface* surface) {
   return true;
 }
 
 void GLContextStub::ReleaseCurrent(GLSurface* surface) {
 }
 
 bool GLContextStub::IsCurrent(GLSurface* surface) {
   return true;
 }
 
 void* GLContextStub::GetHandle() {
   return NULL;
 }
 
 void GLContextStub::SetSwapInterval(int interval) {
 }
 
 std::string GLContextStub::GetExtensions() {
   return std::string();
 }
 
 }  // namespace gfx