Revert of Revert "Typecheck JS files for chrome://extensions"

chrome/browser/resources/extensions/chromeos/kiosk_app_list.js

Index: chrome/browser/resources/extensions/chromeos/kiosk_app_list.js
diff --git a/chrome/browser/resources/extensions/chromeos/kiosk_app_list.js b/chrome/browser/resources/extensions/chromeos/kiosk_app_list.js
index 3652f95bd6d7c2f17ba915270112e04d73ba7abc..28b0b3a921f1de45389a832841a070d295d88ae1 100644
--- a/chrome/browser/resources/extensions/chromeos/kiosk_app_list.js
+++ b/chrome/browser/resources/extensions/chromeos/kiosk_app_list.js
@@ -1,6 +1,18 @@
 // Copyright 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.
+
+/**
+ * The type of the app data object. The definition is based on
+ * chrome/browser/ui/webui/extensions/chromeos/kiosk_apps_handler.cc:
+ *     PopulateAppDict()
+ * @typedef {{id: string,
+ *            name: string,
+ *            iconURL: string,
+ *            autoLaunch: boolean,
+ *            isLoading: boolean}}
+ */
+var AppDict;
 
 cr.define('extensions', function() {
   /** @const */ var List = cr.ui.List;
@@ -49,7 +61,7 @@
 
     /**
      * Updates the given app.
-     * @param {!Object} app An app info object.
+     * @param {!AppDict} app An app info object.
      */
     updateApp: function(app) {
       for (var i = 0; i < this.items.length; ++i) {
@@ -155,9 +167,8 @@
     }
   };
 
-  /*
+  /**
    * True if the app represented by this item will auto launch.
-   * @type {boolean}
    */
   cr.defineProperty(KioskAppListItem, 'autoLaunch', cr.PropertyKind.BOOL_ATTR);