Sync 3rd party wallpaper app name

chrome/common/extensions/api/wallpaper_private.json

 // 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.
 
 [
   {
     "namespace":"wallpaperPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/chromeos/extensions/wallpaper_private_api.h"
     },
@@ skipping 257 matching lines @@
             "description": "The third party custom wallpaper data."
           },
           {
             "type": "binary",
             "name": "thumbnail",
             "description": "The third party custom wallpaper thumbnail data."
           },
           {
             "name": "layout",
             "$ref": "wallpaper.WallpaperLayout"
+          },
+          {
+            "type": "string",
+            "name": "appName",
+            "description": "The third party wallpaper app name."
           }
         ]
       }
     ]
   }
 ]