Support browser side thumbnailing for GPU composited pages on Windows.

chrome/browser/extensions/extension_tabs_module.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/extensions/extension_tabs_module.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 1635 matching lines @@
     return false;
 
   RenderViewHost* render_view_host = web_contents->GetRenderViewHost();
 
   // If a backing store is cached for the tab we want to capture,
   // and it can be copied into a bitmap, then use it to generate the image.
   // This may fail if we can not copy a backing store into a bitmap.
   // For example, some uncommon X11 visual modes are not supported by
   // CopyFromBackingStore().
   skia::PlatformCanvas temp_canvas;
-  if (render_view_host->CopyFromBackingStore(&temp_canvas)) {
+  if (render_view_host->CopyFromBackingStore(gfx::Size(), &temp_canvas)) {
     VLOG(1) << "captureVisibleTab() got image from backing store.";
     SendResultFromBitmap(skia::GetTopDevice(temp_canvas)->accessBitmap(false));
     return true;
   }
 
   // Ask the renderer for a snapshot of the tab.
   TabContentsWrapper* wrapper = browser->GetSelectedTabContentsWrapper();
   registrar_.Add(this,
                  chrome::NOTIFICATION_TAB_SNAPSHOT_TAKEN,
                  content::Source<WebContents>(wrapper->web_contents()));
@@ skipping 145 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   result_.reset(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }