Support browser side thumbnailing for GPU composited pages on Windows.

chrome/browser/aeropeek_manager.cc

 // 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.
 
 #include "chrome/browser/aeropeek_manager.h"
 
 #include <dwmapi.h>
 #include <shobjidl.h>
 
 #include "base/command_line.h"
@@ skipping 980 matching lines @@
   if (!contents)
     return false;
 
   content::RenderViewHost* render_view_host = contents->GetRenderViewHost();
   if (!render_view_host)
     return false;
 
   // Create a copy of this BackingStore image.
   // This code is just copied from "thumbnail_generator.cc".
   skia::PlatformCanvas canvas;
-  if (!render_view_host->CopyFromBackingStore(&canvas))
+  if (!render_view_host->CopyFromBackingStore(gfx::Size(), &canvas))
     return false;
 
   const SkBitmap& bitmap = skia::GetTopDevice(canvas)->accessBitmap(false);
   bitmap.copyTo(preview, SkBitmap::kARGB_8888_Config);
   return true;
 }