GPU: Keep track of the last real context and real surface made current.

ui/gl/gl_surface.h

 // Copyright (c) 2012 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_GL_GL_SURFACE_H_
 #define UI_GL_GL_SURFACE_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 89 matching lines @@
   // Create a GL surface that renders directly to a view.
   static scoped_refptr<GLSurface> CreateViewGLSurface(
       bool software,
       gfx::AcceleratedWidget window);
 
   // Create a GL surface used for offscreen rendering.
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
       bool software,
       const gfx::Size& size);
 
+  // Returns the last GLSurface made current, virtual or real.
   static GLSurface* GetCurrent();
 
+  // Returns the last real GLSurface made current.
+  static GLSurface* GetRealCurrent();
+
  protected:
   virtual ~GLSurface();
   static bool InitializeOneOffInternal();
   static void SetCurrent(GLSurface* surface);
+  static void SetRealCurrent(GLSurface* surface);
 
   static bool ExtensionsContain(const char* extensions, const char* name);
 
  private:
   friend class base::RefCounted<GLSurface>;
   friend class GLContext;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurface);
 };
 
@@ skipping 31 matching lines @@
 
  private:
   scoped_refptr<GLSurface> surface_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceAdapter);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_H_