Support browser side thumbnailing for GPU composited pages on Windows.

content/browser/renderer_host/render_widget_host_impl.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_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 59 matching lines @@
   virtual void Cut() OVERRIDE;
   virtual void Copy() OVERRIDE;
   virtual void CopyToFindPboard() OVERRIDE;
   virtual void Paste() OVERRIDE;
   virtual void PasteAndMatchStyle() OVERRIDE;
   virtual void Delete() OVERRIDE;
   virtual void SelectAll() OVERRIDE;
   virtual void UpdateTextDirection(WebKit::WebTextDirection direction) OVERRIDE;
   virtual void NotifyTextDirection() OVERRIDE;
   virtual void Blur() OVERRIDE;
-  virtual bool CopyFromBackingStore(skia::PlatformCanvas* output) OVERRIDE;
+  virtual bool CopyFromBackingStore(const gfx::Size& dest_size,
+                                    skia::PlatformCanvas* output) OVERRIDE;
 #if defined(TOOLKIT_GTK)
   virtual bool CopyFromBackingStoreToGtkWindow(const gfx::Rect& dest_rect,
                                                GdkWindow* target) OVERRIDE;
 #elif defined(OS_MACOSX)
   virtual gfx::Size GetBackingStoreSize() OVERRIDE;
   virtual bool CopyFromBackingStoreToCGContext(const CGRect& dest_rect,
                                                CGContextRef target) OVERRIDE;
 #endif
   virtual void EnableRendererAccessibility() OVERRIDE;
   virtual void ForwardMouseEvent(
@@ skipping 598 matching lines @@
   bool has_touch_handler_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_