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

ui/gfx/gl/gl_share_group.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_SHARE_GROUP_H_
 #define UI_GFX_GL_GL_SHARE_GROUP_H_
 #pragma once
 
 #include <set>
 
@@ skipping 12 matching lines @@
 
   // These two should only be called from the constructor and destructor of
   // GLContext.
   void AddContext(GLContext* context);
   void RemoveContext(GLContext* context);
 
   // Returns a handle to any initialized context in the share group or NULL if
   // there are no initialized contexts in the share group.
   void* GetHandle();
 
+  // Returns a pointer to any initialized context in the share group
+  // or NULL if there are no initialized contexts in the share group.
+  GLContext* GetContext();
+
  private:
   friend class base::RefCounted<GLShareGroup>;
   ~GLShareGroup();
 
   // References to GLContext are by raw pointer to avoid a reference count
   // cycle.
   typedef std::set<GLContext*> ContextSet;
   ContextSet contexts_;
   DISALLOW_COPY_AND_ASSIGN(GLShareGroup);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SHARE_GROUP_H_