Add error handling for supervised user import flow.

chrome/browser/resources/options/managed_user_import.js

 // 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.
 
 cr.define('options', function() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
    * ManagedUserImportOverlay class.
@@ skipping 57 matching lines @@
       $('create-new-user-link').onclick = function(event) {
         OptionsPage.closeOverlay();
         OptionsPage.navigateToPage('createProfile');
       };
     },
 
     /**
      * @override
      */
     didShowPage: function() {
-      chrome.send('requestManagedUserImportUpdate');
+      options.ManagedUserListData.requestExistingManagedUsers(
+          this.receiveExistingManagedUsers_, this.onSigninError_.bind(this));
 
       this.updateImportInProgress_(false);
       $('managed-user-import-error-bubble').hidden = true;
       $('managed-user-import-ok').disabled = true;
       $('select-avatar-grid').hidden = true;
       $('managed-user-list').hidden = false;
 
       $('managed-user-import-ok').textContent =
           loadTimeData.getString('managedUserImportOk');
       $('managed-user-import-text').textContent =
@@ skipping 23 matching lines @@
       }
 
       var avatarUrl = managedUser.needAvatar ?
           $('select-avatar-grid').selectedItem : managedUser.iconURL;
 
       this.updateImportInProgress_(true);
 
       // 'createProfile' is handled by CreateProfileHandler.
       chrome.send('createProfile', [managedUser.name, avatarUrl,
                                     false, true, managedUser.id]);
+      options.ManagedUserListData.reloadExistingManagedUsers();
     },
 
     /**
      * Hides the 'managed user list' and shows the avatar grid instead.
      * It also updates the overlay text and title to instruct the user
      * to choose an avatar for the supervised user.
      * @private
      */
     showAvatarGridHelper_: function() {
       $('managed-user-list').hidden = true;
@@ skipping 18 matching lines @@
      */
     updateImportInProgress_: function(inProgress) {
       $('managed-user-import-ok').disabled = inProgress;
       $('managed-user-list').disabled = inProgress;
       $('select-avatar-grid').disabled = inProgress;
       $('create-new-user-link').disabled = inProgress;
       $('managed-user-import-throbber').hidden = !inProgress;
     },
 
     /**
-     * Adds all the existing |managedUsers| to the list. If |managedUsers|
-     * is undefined, then the list is cleared.
+     * Sets the data model of the managed user list to |managedUsers|.
      * @param {Array.<Object>} managedUsers An array of managed user objects.
      *     Each object is of the form:
      *       managedUser = {
      *         id: "Managed User ID",
      *         name: "Managed User Name",
      *         iconURL: "chrome://path/to/icon/image",
      *         onCurrentDevice: true or false,
      *         needAvatar: true or false
      *       }
      * @private
      */
     receiveExistingManagedUsers_: function(managedUsers) {
-      if (!managedUsers) {
-        $('managed-user-list').dataModel = null;
-        return;
-      }
-
       managedUsers.sort(function(a, b) {
         return a.name.localeCompare(b.name);
       });
 
       $('managed-user-list').dataModel = new ArrayDataModel(managedUsers);
       if (managedUsers.length == 0) {
         this.onError_(loadTimeData.getString('noExistingManagedUsers'));
         $('managed-user-import-ok').disabled = true;
+      } else {
+        // Hide the error bubble.
+        $('managed-user-import-error-bubble').hidden = true;
       }
     },
 
-    /**
-     * @private
-     */
-    hideErrorBubble_: function() {
-      $('managed-user-import-error-bubble').hidden = true;
+    onSigninError_: function() {
+      $('managed-user-list').dataModel = null;
+      this.onError_(loadTimeData.getString('managedUserImportSigninError'));
     },
 
     /**
      * Displays an error message if an error occurs while
      * importing a managed user.
      * Called by BrowserOptions via the BrowserOptionsHandler.
      * @param {string} error The error message to display.
      * @private
      */
     onError_: function(error) {
       var errorBubble = $('managed-user-import-error-bubble');
       errorBubble.hidden = false;
       errorBubble.textContent = error;
       this.updateImportInProgress_(false);
     },
 
     /**
      * Closes the overlay if importing the managed user was successful.
      * @private
      */
     onSuccess_: function() {
       this.updateImportInProgress_(false);
       OptionsPage.closeOverlay();
     },
   };
 
   // Forward public APIs to private implementations.
   [
-    'hideErrorBubble',
-    'onError',
     'onSuccess',
-    'receiveExistingManagedUsers',
   ].forEach(function(name) {
     ManagedUserImportOverlay[name] = function() {
       var instance = ManagedUserImportOverlay.getInstance();
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     ManagedUserImportOverlay: ManagedUserImportOverlay,
   };
 });