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

ui/gfx/gl/gl_context.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_GL_GL_CONTEXT_H_
 #define UI_GFX_GL_GL_CONTEXT_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/gl/gl_share_group.h"
+#include "ui/gfx/gl/gpu_preference.h"
 
 namespace gfx {
 
 class GLSurface;
 
 // Encapsulates an OpenGL context, hiding platform specific management.
 class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
  public:
   explicit GLContext(GLShareGroup* share_group);
 
   // Initializes the GL context to be compatible with the given surface. The GL
   // context can be made with other surface's of the same type. The compatible
   // surface is only needed for certain platforms like WGL, OSMesa and GLX. It
   // should be specific for all platforms though.
-  virtual bool Initialize(GLSurface* compatible_surface) = 0;
+  virtual bool Initialize(
+      GLSurface* compatible_surface, GpuPreference gpu_preference) = 0;
 
   // Destroys the GL context.
   virtual void Destroy() = 0;
 
   // Makes the GL context and a surface current on the current thread.
   virtual bool MakeCurrent(GLSurface* surface) = 0;
 
   // Releases this GL context and surface as current on the current thread.
   virtual void ReleaseCurrent(GLSurface* surface) = 0;
 
@@ skipping 14 matching lines @@
   // context must be current.
   bool HasExtension(const char* name);
 
   GLShareGroup* share_group();
 
   // Create a GL context that is compatible with the given surface.
   // |share_group|, if non-NULL, is a group of contexts which the
   // internally created OpenGL context shares textures and other resources.
   static scoped_refptr<GLContext> CreateGLContext(
       GLShareGroup* share_group,
-      GLSurface* compatible_surface);
+      GLSurface* compatible_surface,
+      GpuPreference gpu_preference);
 
   static bool LosesAllContextsOnContextLost();
 
+  static bool SupportsDualGpus();
+
   static GLContext* GetCurrent();
 
   virtual bool WasAllocatedUsingARBRobustness();
 
  protected:
   virtual ~GLContext();
   static void SetCurrent(GLContext* context, GLSurface* surface);
 
  private:
   scoped_refptr<GLShareGroup> share_group_;
   friend class base::RefCounted<GLContext>;
   DISALLOW_COPY_AND_ASSIGN(GLContext);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_CONTEXT_H_