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

gpu/demos/framework/window.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 "gpu/demos/framework/window.h"
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
@@ skipping 55 matching lines @@
   gpu_scheduler_.reset(new gpu::GpuScheduler(command_buffer_.get(),
                                              decoder_.get(),
                                              NULL));
 
   decoder_->set_engine(gpu_scheduler_.get());
 
   surface_ = gfx::GLSurface::CreateViewGLSurface(false, hwnd);
   if (!surface_.get())
     return false;
 
-  context_ = gfx::GLContext::CreateGLContext(NULL, surface_.get());
+  context_ = gfx::GLContext::CreateGLContext(
+      NULL, surface_.get(), gfx::PreferDiscreteGpu);
   if (!context_.get())
     return false;
 
   std::vector<int32> attribs;
   if (!decoder_->Initialize(surface_.get(),
                             context_.get(),
                             gfx::Size(),
                             gpu::gles2::DisallowedFeatures(),
                             NULL,
                             attribs)) {
@@ skipping 18 matching lines @@
                                                 transfer_buffer.size,
                                                 transfer_buffer.ptr,
                                                 transfer_buffer_id,
                                                 false,
                                                 true));
   return true;
 }
 
 }  // namespace demos
 }  // namespace gpu