Allow CopyFromBackingStore to fallback to copying from the renderer side if the accelerated surface…

content/renderer/render_widget.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 CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 338 matching lines @@
   virtual bool ForceCompositingModeEnabled();
 
   // WebGraphicsContext3DSwapBuffersClient implementation.
 
   // Called by a GraphicsContext associated with this view when swapbuffers
   // is posted, completes or is aborted.
   virtual void OnViewContextSwapBuffersPosted() OVERRIDE;
   virtual void OnViewContextSwapBuffersComplete() OVERRIDE;
   virtual void OnViewContextSwapBuffersAborted() OVERRIDE;
 
+  void OnSnapshot(const gfx::Rect& src_subrect);
+
   // Detects if a suitable opaque plugin covers the given paint bounds with no
   // compositing necessary.
   //
   // Returns the plugin instance that's the source of the paint if the paint
   // can be handled by just blitting the plugin bitmap. In this case, the
   // location, clipping, and ID of the backing store will be filled into the
   // given output parameters.
   //
   // A return value of null means optimized painting can not be used and we
   // should continue with the normal painting code path.
@@ skipping 313 matching lines @@
   bool is_threaded_compositing_enabled_;
 
   base::WeakPtrFactory<RenderWidget> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_