Sync online wallpaper

chrome/browser/resources/chromeos/wallpaper_manager/js/util.js

 // 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.
 
 var WallpaperUtil = {};
 
 /**
  * Saves value to local storage that associates with key.
  * @param {string} key The key that associates with value.
  * @param {string} value The value to save to local storage.
+ * @param {boolen} sync True if the value is saved to sync storage.
  * @param {function=} opt_callback The callback on success, or on failure.
  */
-WallpaperUtil.saveToLocalStorage = function(key, value, opt_callback) {
+WallpaperUtil.saveToStorage = function(key, value, sync, opt_callback) {
   var items = {};
   items[key] = value;
-  Constants.WallpaperLocalStorage.set(items, opt_callback);
+  if (sync)
+    Constants.WallpaperSyncStorage.set(items, opt_callback);
+  else
+    Constants.WallpaperLocalStorage.set(items, opt_callback);
 };
 
 /**
+ * Saves user's wallpaper infomation to local and sync storage. Note that local
+ * value should be saved first.
+ * @param {string} url The url address of wallpaper. For custom wallpaper, it is
+ *     the file name.
+ * @param {string} layout The wallpaper layout.
+ * @param {string} source The wallpaper source.
+ */
+WallpaperUtil.saveWallpaperInfo = function(url, layout, source) {
+  var wallpaperInfo = {
+      url: url,
+      layout: layout,
+      source: source
+  };
+  WallpaperUtil.saveToStorage(Constants.AccessLocalWallpaperInfoKey,
+                              wallpaperInfo, false, function() {
+    WallpaperUtil.saveToStorage(Constants.AccessSyncWallpaperInfoKey,
+                                wallpaperInfo, true);
+  });
+};
+
+/**
  * Downloads resources from url. Calls onSuccess and opt_onFailure accordingly.
  * @param {string} url The url address where we should fetch resources.
  * @param {string} type The response type of XMLHttprequest.
  * @param {function} onSuccess The success callback. It must be called with
  *     current XMLHttprequest object.
  * @param {function} onFailure The failure callback.
  * @param {XMLHttpRequest=} opt_xhr The XMLHttpRequest object.
  */
 WallpaperUtil.fetchURL = function(url, type, onSuccess, onFailure, opt_xhr) {
   var xhr;
@@ skipping 31 matching lines @@
       Constants.WallpaperSourceEnum.Online, function(exists) {
     if (exists) {
       onSuccess();
       return;
     }
 
     self.fetchURL(url, 'arraybuffer', function(xhr) {
       if (xhr.response != null) {
         chrome.wallpaperPrivate.setWallpaper(xhr.response, layout, url,
                                              onSuccess);
+        self.saveWallpaperInfo(url, layout,
+                               Constants.WallpaperSourceEnum.Online);
       } else {
         onFailure();
       }
     }, onFailure);
   });
 };