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

ui/gfx/gl/gl_context_egl.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_egl.h"
 
 #include "build/build_config.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/angle/include/EGL/egl.h"
@@ skipping 24 matching lines @@
 GLContextEGL::GLContextEGL(GLShareGroup* share_group)
     : GLContext(share_group),
       context_(NULL)
 {
 }
 
 GLContextEGL::~GLContextEGL() {
   Destroy();
 }
 
-bool GLContextEGL::Initialize(GLSurface* compatible_surface) {
+bool GLContextEGL::Initialize(
+    GLSurface* compatible_surface, GpuPreference gpu_preference) {
   DCHECK(compatible_surface);
   DCHECK(!context_);
 
   static const EGLint kContextAttributes[] = {
     EGL_CONTEXT_CLIENT_VERSION, 2,
     EGL_NONE
   };
 
   GLSurfaceEGL* egl_surface = static_cast<GLSurfaceEGL*>(compatible_surface);
   display_ = egl_surface->GetDisplay();
@@ skipping 82 matching lines @@
 
 void GLContextEGL::SetSwapInterval(int interval) {
   DCHECK(IsCurrent(NULL));
   if (!eglSwapInterval(display_, interval)) {
     LOG(ERROR) << "eglSwapInterval failed with error "
                << GetLastEGLErrorString();
   }
 }
 
 }  // namespace gfx