Sync 3rd party wallpaper app name

chrome/browser/chromeos/extensions/wallpaper_private_api.cc

 // Copyright (c) 2013 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/chromeos/extensions/wallpaper_private_api.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 616 matching lines @@
 
   bool update_wallpaper =
       account_id_ ==
       user_manager::UserManager::Get()->GetActiveUser()->GetAccountId();
   wallpaper_manager->SetCustomWallpaper(
       account_id_, user_id_hash_, params->file_name, layout,
       user_manager::User::CUSTOMIZED, image, update_wallpaper);
   unsafe_wallpaper_decoder_ = NULL;
 
   Profile* profile = Profile::FromBrowserContext(browser_context());
-  // This API is only available to the component wallpaper picker. We do not
-  // need to show the app's name if it is the component wallpaper picker. So set
-  // the pref to empty string.
+  // TODO(xdai): This preference is unused now. For compatiblity concern, we
+  // need to keep it until it's safe to clean it up.
   profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
                                  std::string());
 
   if (params->generate_thumbnail) {
     image.EnsureRepsForSupportedScales();
     scoped_ptr<gfx::ImageSkia> deep_copy(image.DeepCopy());
     // Generates thumbnail before call api function callback. We can then
     // request thumbnail in the javascript callback.
     task_runner->PostTask(FROM_HERE,
         base::Bind(
@@ skipping 277 matching lines @@
                  this, file_list));
 }
 
 void WallpaperPrivateGetOfflineWallpaperListFunction::OnComplete(
     const std::vector<std::string>& file_list) {
   base::ListValue* results = new base::ListValue();
   results->AppendStrings(file_list);
   SetResult(results);
   SendResponse(true);
 }