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 68 matching lines @@
   virtual void Blur() OVERRIDE;
   virtual bool CopyFromBackingStore(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 bool CopyFromCompositingSurface(
+      const gfx::Size& size,
+      skia::PlatformCanvas* output) OVERRIDE;
   virtual void EnableRendererAccessibility() OVERRIDE;
   virtual void ForwardMouseEvent(
       const WebKit::WebMouseEvent& mouse_event) OVERRIDE;
   virtual void ForwardWheelEvent(
       const WebKit::WebMouseWheelEvent& wheel_event) OVERRIDE;
   virtual void ForwardKeyboardEvent(
       const NativeWebKeyboardEvent& key_event) OVERRIDE;
   virtual const gfx::Point& GetLastScrollOffset() const OVERRIDE;
   virtual RenderProcessHost* GetProcess() const OVERRIDE;
   virtual int GetRoutingID() const OVERRIDE;
@@ skipping 587 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_