Command to mark surface inactive, so gpu process can release resources.

ui/gfx/gl/gl_surface.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_SURFACE_H_
 #define UI_GFX_GL_GL_SURFACE_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
@@ skipping 35 matching lines @@
 
   // Returns the internal frame buffer object name if the surface is backed by
   // FBO. Otherwise returns 0.
   virtual unsigned int GetBackingFrameBufferObject();
 
   static bool InitializeOneOff();
 
   // Called after a context is made current with this surface.
   virtual void OnMakeCurrent(GLContext* context);
 
+  virtual void OnSetSurfaceVisible(bool visible);

[apatrick_chromium, 2011/10/13 19:51:31]

I think it's okay to add this to GLSurface. I would be tempted to call it just
SetVisible or SetVisibility though since it is implicit that the operation is on
a surface and it is more of a command to change the visibility than an event
handler.

+
   // Create a GL surface that renders directly to a view.
   static scoped_refptr<GLSurface> CreateViewGLSurface(
       bool software,
       gfx::PluginWindowHandle window);
 
   // Create a GL surface used for offscreen rendering.
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
       bool software,
       const gfx::Size& size);
 
   static GLSurface* GetCurrent();
 
  protected:
   virtual ~GLSurface();
   static void SetCurrent(GLSurface* surface);
 
  private:
   friend class base::RefCounted<GLSurface>;
   friend class GLContext;
   DISALLOW_COPY_AND_ASSIGN(GLSurface);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_H_