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

ui/gfx/surface/accelerated_surface_mac.h

 // 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.
 
 #ifndef UI_GFX_SURFACE_ACCELERATED_SURFACE_MAC_H_
 #define UI_GFX_SURFACE_ACCELERATED_SURFACE_MAC_H_
 #pragma once
 
 #include <CoreFoundation/CoreFoundation.h>
 
 #include "base/callback_old.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/gfx/gl/gl_context.h"
+#include "ui/gfx/gl/gl_surface.h"
+#include "ui/gfx/gl/gpu_preference.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
-#include "ui/gfx/gl/gl_context.h"
-#include "ui/gfx/gl/gl_surface.h"
 #include "ui/gfx/surface/surface_export.h"
 #include "ui/gfx/surface/transport_dib.h"
 
 // Should not include GL headers in a header file. Forward declare these types
 // instead.
 typedef struct _CGLContextObject* CGLContextObj;
 typedef unsigned int GLenum;
 typedef unsigned int GLuint;
 
 namespace gfx {
@@ skipping 11 matching lines @@
   virtual ~AcceleratedSurface();
 
   // Set up internal buffers. |share_context|, if non-NULL, is a context
   // with which the internally created OpenGL context shares textures and
   // other resources. |allocate_fbo| indicates whether or not this surface
   // should allocate an offscreen frame buffer object (FBO) internally. If
   // not, then the user is expected to allocate one. NOTE that allocating
   // an FBO internally does NOT work properly with client code which uses
   // OpenGL (i.e., via GLES2 command buffers), because the GLES2
   // implementation does not know to bind the accelerated surface's
-  // internal FBO when the default FBO is bound. Returns false upon
+  // internal FBO when the default FBO is bound. |gpu_preference| indicates
+  // the GPU preference for the internally allocated GLContext. If
+  // |share_context| is non-NULL, then on platforms supporting dual GPUs,
+  // its GPU preference must match the passed one. Returns false upon
   // failure.
-  bool Initialize(gfx::GLContext* share_context, bool allocate_fbo);
+  bool Initialize(gfx::GLContext* share_context,
+                  bool allocate_fbo,
+                  gfx::GpuPreference gpu_preference);
   // Tear down. Must be called before destructor to prevent leaks.
   void Destroy();
 
   // These methods are used only once the accelerated surface is initialized.
 
   // Sets the accelerated surface to the given size, creating a new one if
   // the height or width changes. Returns a unique id of the IOSurface to
   // which the surface is bound, or 0 if no changes were made or an error
   // occurred. MakeCurrent() will have been called on the new surface.
   uint64 SetSurfaceSize(const gfx::Size& size);
@@ skipping 106 matching lines @@
   // true.
   GLuint fbo_;
   GLuint depth_stencil_renderbuffer_;
   // Allocate a TransportDIB in the renderer.
   scoped_ptr<Callback2<size_t, TransportDIB::Handle*>::Type>
       dib_alloc_callback_;
   scoped_ptr<Callback1<TransportDIB::Id>::Type> dib_free_callback_;
 };
 
 #endif  // UI_GFX_SURFACE_ACCELERATED_SURFACE_MAC_H_