Use low resolution wallpaper for small screens.

chrome/browser/ui/webui/options2/chromeos/set_wallpaper_options_handler.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/ui/webui/options2/chromeos/set_wallpaper_options_handler.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 230 matching lines @@
 void SetWallpaperOptionsHandler::HandleDailyWallpaper(const ListValue* args) {
   User::WallpaperType type;
   int index;
   base::Time date;
   WallpaperManager::Get()->GetLoggedInUserWallpaperProperties(
       &type, &index, &date);
   if (date != base::Time::Now().LocalMidnight())
     index = ash::GetNextWallpaperIndex(index);
   UserManager::Get()->SaveLoggedInUserWallpaperProperties(User::DAILY, index);
   ash::Shell::GetInstance()->desktop_background_controller()->
-      SetDefaultWallpaper(index);
+      SetDefaultWallpaper(index, false);
   base::StringValue image_url(GetDefaultWallpaperThumbnailURL(index));
   base::FundamentalValue is_daily(true);
   web_ui()->CallJavascriptFunction("SetWallpaperOptions.setSelectedImage",
                                    image_url, is_daily);
 }
 
 gfx::NativeWindow SetWallpaperOptionsHandler::GetBrowserWindow() const {
   Browser* browser =
       browser::FindBrowserWithWebContents(web_ui()->GetWebContents());
   return browser->window()->GetNativeWindow();
 }
 
 }  // namespace options2
 }  // namespace chromeos