Support copying a partial rectangle region from the compositing surface on Aura and GTK.

content/browser/renderer_host/render_widget_host_view_aura.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 79 matching lines @@
       const gfx::Rect& scroll_rect, int scroll_dx, int scroll_dy,
       const std::vector<gfx::Rect>& copy_rects) OVERRIDE;
   virtual void RenderViewGone(base::TerminationStatus status,
                               int error_code) OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual void SetTooltipText(const string16& tooltip_text) OVERRIDE;
   virtual void SelectionBoundsChanged(const gfx::Rect& start_rect,
                                       const gfx::Rect& end_rect) OVERRIDE;
   virtual BackingStore* AllocBackingStore(const gfx::Size& size) OVERRIDE;
   virtual void CopyFromCompositingSurface(
-      const gfx::Size& size,
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
       const base::Callback<void(bool)>& callback,
       skia::PlatformCanvas* output) OVERRIDE;
   virtual void OnAcceleratedCompositingStateChange() OVERRIDE;
   virtual void AcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params_in_pixel,
       int gpu_host_id) OVERRIDE;
   virtual void AcceleratedSurfacePostSubBuffer(
       const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params_in_pixel,
       int gpu_host_id) OVERRIDE;
   virtual void AcceleratedSurfaceSuspend() OVERRIDE;
@@ skipping 230 matching lines @@
 
   // This lock is for waiting for a front surface to become available to draw.
   scoped_refptr<aura::CompositorLock> released_front_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_