Convert wallpaper picker to v2 app

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

 // 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.
 
 /**
  * WallpaperManager constructor.
  *
  * WallpaperManager objects encapsulate the functionality of the wallpaper
  * manager extension.
  *
  * @constructor
  * @param {HTMLElement} dialogDom The DOM node containing the prototypical
  *     extension UI.
  */
 
 function WallpaperManager(dialogDom) {
   this.dialogDom_ = dialogDom;
   this.document_ = dialogDom.ownerDocument;
   this.selectedCategory = null;
   this.butterBar_ = new ButterBar(this.dialogDom_);
   this.customWallpaperData_ = null;
   this.currentWallpaper_ = null;
   this.fetchManifest_();
-  this.initDom_();
 }
 
 // Anonymous 'namespace'.
 // TODO(bshe): Get rid of anonymous namespace.
 (function() {
 
   /**
    * Base URL of the manifest file.
    */
   /** @const */ var ManifestBaseURL = 'https://commondatastorage.googleapis.' +
@@ skipping 41 matching lines @@
       this.manifest_ = {};
     }
   };
 
   /**
    * Requests wallpaper manifest file from server.
    */
   WallpaperManager.prototype.fetchManifest_ = function() {
     var xhr = new XMLHttpRequest();
     var locale = navigator.language;
-    xhr.open('GET', ManifestBaseURL + locale + '.json', false);
+    xhr.open('GET', ManifestBaseURL + locale + '.json', true);
     xhr.send(null);
-    // TODO(bshe): We should save the downloaded manifest to local disk. Other
-    // components may want to use it (i.e. screen saver).
-    if (xhr.status === 200) {
-      this.parseManifest_(xhr.responseText);
-    } else {
-      // Fall back to en locale if current locale is not supported.
-      xhr.open('GET', ManifestBaseURL + 'en.json', false);
-      xhr.send(null);
+    var self = this;
+
+    xhr.addEventListener('load', function(e) {
+      // TODO(bshe): We should save the downloaded manifest to local disk. Other
+      // components may want to use it (i.e. screen saver).
       if (xhr.status === 200) {
-        this.parseManifest_(xhr.responseText);
+        self.parseManifest_(xhr.responseText);
+        self.initDom_();
       } else {
-        this.manifest_ = {};
-        this.butterBar_.showError_(str('connectionFailed'));
+        // Fall back to en locale if current locale is not supported.
+        xhr.open('GET', ManifestBaseURL + 'en.json', true);
+        xhr.send(null);
+        xhr.addEventListener('load', function(e) {
+          if (xhr.status === 200) {
+            self.parseManifest_(xhr.responseText);
+          } else {
+            self.manifest_ = {};
+            self.butterBar_.showError_(str('connectionFailed'));
+          }
+          self.initDom_();
+        });
       }
-    }
+    });
 
     // TODO(bshe): Fall back to saved manifest if there is a problem fetching
     // manifest from server.
   };
 
   /**
    * One-time initialization of various DOM nodes.
    */
   WallpaperManager.prototype.initDom_ = function() {
     i18nTemplate.process(this.document_, loadTimeData);
@@ skipping 264 matching lines @@
             selectedItem = wallpaperInfo;
           }
         }
       }
       this.wallpaperGrid_.dataModel = wallpapersDataModel;
       this.wallpaperGrid_.selectedItem = selectedItem;
     }
   };
 
 })();