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

ui/gfx/gl/gl_context_osmesa.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 <GL/osmesa.h>
 
 #include "ui/gfx/gl/gl_context_osmesa.h"
 
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
 #include "ui/gfx/gl/gl_surface_osmesa.h"
 
 namespace gfx {
 
 GLContextOSMesa::GLContextOSMesa(GLShareGroup* share_group)
     : GLContext(share_group),
       context_(NULL) {
 }
 
 GLContextOSMesa::~GLContextOSMesa() {
   Destroy();
 }
 
-bool GLContextOSMesa::Initialize(GLSurface* compatible_surface) {
+bool GLContextOSMesa::Initialize(
+    GLSurface* compatible_surface, GpuPreference gpu_preference) {
   DCHECK(!context_);
 
   OSMesaContext share_handle = static_cast<OSMesaContext>(
       share_group() ? share_group()->GetHandle() : NULL);
 
   GLuint format =
       static_cast<GLSurfaceOSMesa*>(compatible_surface)->GetFormat();
   DCHECK_NE(format, (unsigned)0);
   context_ = OSMesaCreateContextExt(format,
                                     0,  // depth bits
@@ skipping 76 matching lines @@
 void* GLContextOSMesa::GetHandle() {
   return context_;
 }
 
 void GLContextOSMesa::SetSwapInterval(int interval) {
   DCHECK(IsCurrent(NULL));
   LOG(WARNING) << "GLContextOSMesa::SetSwapInterval is ignored.";
 }
 
 }  // namespace gfx