wallpaper-webui: Make sure the wallpaper thumbnails are appropriately scaled.

chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source.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 CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_WALLPAPER_THUMBNAIL_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_WALLPAPER_THUMBNAIL_SOURCE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
+#include "ui/base/layout.h"
 
 namespace base {
 class RefCountedBytes;
 }
 
 namespace chromeos {
 
 class User;
 
 namespace options2 {
@@ skipping 20 matching lines @@
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
                                 int request_id) OVERRIDE;
 
  private:
   class ThumbnailEncodingOperation;
 
   virtual ~WallpaperThumbnailSource();
 
   void GetCurrentUserThumbnail(const std::string& path,
+                               ui::ScaleFactor scale_factor,
                                int request_id);
 
   void StartCustomThumbnailEncodingOperation(const chromeos::User* user,
+                                             ui::ScaleFactor scale_factor,
                                              int request_id);
 
   void CancelPendingCustomThumbnailEncodingOperation();
 
   void SendCurrentUserNullThumbnail(int request_id);
 
   void SendCurrentUserCustomThumbnail(
       scoped_refptr<base::RefCountedBytes> data,
       int request_id);
 
   void SendCurrentUserDefaultThumbnail(const std::string& path,
+                                       ui::ScaleFactor scale_factor,
                                        int request_id);
 
   scoped_refptr<ThumbnailEncodingOperation> thumbnail_encoding_op_;
 
   base::WeakPtrFactory<WallpaperThumbnailSource> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperThumbnailSource);
 };
 
 }  // namespace options2
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_WALLPAPER_THUMBNAIL_SOURCE_H_