Enable accelerated compositing of web pages when using webkit compositor

ui/gfx/compositor/compositor_gl.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_COMPOSITOR_COMPOSITOR_GL_H_
 #define UI_GFX_COMPOSITOR_COMPOSITOR_GL_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/compositor/compositor.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 class GLContext;
 class GLSurface;
 class Rect;
 }
 
 namespace ui {
 
 class CompositorGL;
 class TextureProgramGL;
 
 // We share resources (such as shaders) between different Compositors via
 // GLContext sharing so that we only have to create/destroy them once.
-class COMPOSITOR_EXPORT SharedResources {
+class COMPOSITOR_EXPORT SharedResourcesGL : public SharedResources {
  public:
-  static SharedResources* GetInstance();
+  static SharedResourcesGL* GetInstance();
 
-  bool MakeSharedContextCurrent();
+  virtual bool MakeSharedContextCurrent();
 
   // Creates a context that shares the resources hosted by this singleton.
   scoped_refptr<gfx::GLContext> CreateContext(gfx::GLSurface* surface);
 
   ui::TextureProgramGL* program_no_swizzle() {
     return program_no_swizzle_.get();
   }
 
   ui::TextureProgramGL* program_swizzle() {
     return program_swizzle_.get();
   }
 
  private:
-  friend struct DefaultSingletonTraits<SharedResources>;
+  friend struct DefaultSingletonTraits<SharedResourcesGL>;
 
-  SharedResources();
-  virtual ~SharedResources();
+  SharedResourcesGL();
+  virtual ~SharedResourcesGL();
 
   bool Initialize();
   void Destroy();
 
   bool initialized_;
 
   scoped_refptr<gfx::GLContext> context_;
   scoped_refptr<gfx::GLSurface> surface_;
 
   scoped_ptr<ui::TextureProgramGL> program_swizzle_;
   scoped_ptr<ui::TextureProgramGL> program_no_swizzle_;
 
-  DISALLOW_COPY_AND_ASSIGN(SharedResources);
+  DISALLOW_COPY_AND_ASSIGN(SharedResourcesGL);
 };
 
 class COMPOSITOR_EXPORT TextureGL : public Texture {
  public:
   TextureGL();
 
   virtual void SetCanvas(const SkCanvas& canvas,
                          const gfx::Point& origin,
                          const gfx::Size& overall_size) OVERRIDE;
 
@@ skipping 43 matching lines @@
 
   // Keep track of whether compositing has started or not.
   bool started_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorGL);
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_COMPOSITOR_GL_H_