New kiosk UI: handle edge cases

chrome/browser/resources/chromeos/login/header_bar.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.
 
 /**
  * @fileoverview Login UI header bar implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 146 matching lines @@
      * If true then "Browse as Guest" button is shown.
      *
      * @type {boolean}
      */
     set showGuestButton(value) {
       this.showGuest_ = value;
       this.updateUI_();
     },
 
     /**
-     * Update current header bar UI.
+     * Current header bar UI / sign in state.
      *
      * @type {number} state Current state of the sign-in screen (see
      *       SIGNIN_UI_STATE).
      */
+    get signinUIState() {
+      return this.signinUIState_;
+    },
     set signinUIState(state) {
       this.signinUIState_ = state;
       this.updateUI_();
     },
 
     /**
      * Whether the Cancel button is enabled during Gaia sign-in.
      *
      * @type {boolean}
      */
@@ skipping 99 matching lines @@
    * Convenience wrapper of animateIn.
    */
   HeaderBar.animateIn = function() {
     $('login-header-bar').animateIn();
   }
 
   return {
     HeaderBar: HeaderBar
   };
 });