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 299 matching lines @@
   void OnSmoothScrollCompleted(int gesture_id);
   void OnSetTextDirection(WebKit::WebTextDirection direction);
   void OnGetFPS();
   void OnScreenInfoChanged(const WebKit::WebScreenInfo& screen_info);
   void OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
                            const gfx::Rect& window_screen_rect);
 #if defined(OS_ANDROID)
   void OnImeBatchStateChanged(bool is_begin);
   void OnShowImeIfNeeded();
 #endif
+  void OnSnapshot(const gfx::Rect& src_subrect);
 
   // Notify the compositor about a change in viewport size. This should be
   // used only with auto resize mode WebWidgets, as normal WebWidgets should
   // go through OnResize.
   void AutoResizeCompositor();
 
   virtual void SetDeviceScaleFactor(float device_scale_factor);
 
   // Override points to notify derived classes that a paint has happened.
   // WillInitiatePaint happens when we're about to generate a new bitmap and
@@ skipping 141 matching lines @@
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) {}
 
   // Check whether the WebWidget has any touch event handlers registered
   // at the given point.
   virtual bool HasTouchEventHandlersAt(const gfx::Point& point) const;
 
   // Creates a 3D context associated with this view.
   WebKit::WebGraphicsContext3D* CreateGraphicsContext3D(
       const WebKit::WebGraphicsContext3D::Attributes& attributes);
 
+  bool OnSnapshotHelper(const gfx::Rect& src_subrect, SkBitmap* bitmap);
+
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
   int32 surface_id_;
 
   // We are responsible for destroying this object via its Close method.
   WebKit::WebWidget* webwidget_;
 
   // This is lazily constructed and must not outlive webwidget_.
@@ skipping 189 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_