Implement CompositorCC::ReadPixels

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"
@@ skipping 88 matching lines @@
 };
 
 class COMPOSITOR_EXPORT CompositorGL : public Compositor {
  public:
   CompositorGL(CompositorDelegate* delegate,
                gfx::AcceleratedWidget widget,
                const gfx::Size& size);
   virtual ~CompositorGL();
 
   // Overridden from Compositor.
-  virtual void ReadPixels(SkBitmap* bitmap) OVERRIDE;
+  virtual bool ReadPixels(SkBitmap* bitmap) OVERRIDE;
 
   void MakeCurrent();
   gfx::Size GetSize();
 
  protected:
   virtual void OnWidgetSizeChanged() OVERRIDE;
 
  private:
   // Overridden from Compositor.
   virtual Texture* CreateTexture() OVERRIDE;
   virtual void OnNotifyStart(bool clear) OVERRIDE;
   virtual void OnNotifyEnd() OVERRIDE;
   virtual void Blur(const gfx::Rect& bounds) OVERRIDE;
 
   // The GL context used for compositing.
   scoped_refptr<gfx::GLSurface> gl_surface_;
   scoped_refptr<gfx::GLContext> gl_context_;
 
   // 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_