Support browser side thumbnailing for GPU composited pages on Windows.

content/browser/renderer_host/render_widget_host_view_win.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_WIN_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 151 matching lines @@
   virtual gfx::NativeViewId GetNativeViewId() const OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual bool HasFocus() const OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual bool IsShowing() OVERRIDE;
   virtual gfx::Rect GetViewBounds() const OVERRIDE;
   virtual void UnhandledWheelEvent(
       const WebKit::WebMouseWheelEvent& event) OVERRIDE;
   virtual void SetBackground(const SkBitmap& background) OVERRIDE;
+  virtual bool CopyFromCompositingSurface(
+      const gfx::Size& size,
+      skia::PlatformCanvas* output) OVERRIDE;
 
   // Implementation of RenderWidgetHostViewPort.
   virtual void InitAsPopup(content::RenderWidgetHostView* parent_host_view,
                            const gfx::Rect& pos) OVERRIDE;
   virtual void InitAsFullscreen(
       content::RenderWidgetHostView* reference_host_view) OVERRIDE;
   virtual void DidBecomeSelected() OVERRIDE;
   virtual void WasHidden() OVERRIDE;
   virtual void MovePluginWindows(
       const std::vector<webkit::npapi::WebPluginGeometry>& moves) OVERRIDE;
@@ skipping 378 matching lines @@
   // Region in which the view will be transparent to clicks.
   scoped_ptr<SkRegion> transparent_region_;
 
   // Are touch events currently enabled?
   bool touch_events_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewWin);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_