Fixed header bar UI behaviour.

chrome/browser/resources/chromeos/login/screen_gaia_signin.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 Oobe signin screen implementation.
  */
 
 cr.define('login', function() {
   // Gaia loading time after which portal check should be fired.
   /** @const */ var GAIA_LOADING_PORTAL_SUSSPECT_TIME_SEC = 5;
 
   // Maximum Gaia loading time in seconds.
   /** @const */ var MAX_GAIA_LOADING_TIME_SEC = 60;
 
-  // Network state constants.
-  /** @const */ var NET_STATE = {
-    OFFLINE: 0,
-    ONLINE: 1,
-    PORTAL: 2,
-    CONNECTING: 3,
-    UNKNOWN: 4
-  };
-
   // Frame loading errors.
   /** @const */ var NET_ERROR = {
     ABORTED_BY_USER: 3
   };
 
   /**
    * Creates a new sign in screen div.
    * @constructor
    * @extends {HTMLDivElement}
    */
@@ skipping 143 matching lines @@
       this.showLoadingUI_(loading);
     },
 
     /**
      * Event handler that is invoked just before the frame is shown.
      * @param {string} data Screen init payload. Url of auth extension start
      *                      page.
      */
     onBeforeShow: function(data) {
       chrome.send('loginUIStateChanged', ['gaia-signin', true]);
-      $('login-header-bar').signinUIActive = true;
+      $('login-header-bar').signinUIState = SIGNIN_UI_STATE.GAIA_SIGNIN;
 
       // Announce the name of the screen, if accessibility is on.
       $('gaia-signin-aria-label').setAttribute(
           'aria-label', localStrings.getString('signinScreenTitle'));
 
       // Button header is always visible when sign in is presented.
       // Header is hidden once GAIA reports on successful sign in.
       Oobe.getInstance().headerHidden = false;
     },
 
     /**
      * Event handler that is invoked just before the screen is hidden.
      */
     onBeforeHide: function() {
       chrome.send('loginUIStateChanged', ['gaia-signin', false]);
-      $('login-header-bar').signinUIActive = false;
+      $('login-header-bar').signinUIState = SIGNIN_UI_STATE.HIDDEN;
     },
 
     /**
      * Loads the authentication extension into the iframe.
      * @param {Object} data Extension parameters bag.
      * @private
      */
     loadAuthExtension_: function(data) {
       this.silentLoad_ = data.silentLoad;
       this.isLocal = data.isLocal;
@@ skipping 137 matching lines @@
      * @param {boolean} forceOnline Whether online sign-in should be forced.
      * If |forceOnline| is false previously used sign-in type will be used.
      */
     reset: function(takeFocus, forceOnline) {
       // Reload and show the sign-in UI if needed.
       if (takeFocus) {
         if (!forceOnline && this.isLocal) {
           // Show 'Cancel' button to allow user to return to the main screen
           // (e.g. this makes sense when connection is back).
           Oobe.getInstance().headerHidden = false;
-          $('login-header-bar').signinUIActive = true;
+          $('login-header-bar').signinUIState = SIGNIN_UI_STATE.GAIA_SIGNIN;
           // Do nothing, since offline version is reloaded after an error comes.
         } else {
           Oobe.showSigninUI();
         }
       }
     },
 
     /**
      * Clears retry data.
      * @private
@@ skipping 125 matching lines @@
     // Check current network state if currentScreen is a Gaia signin.
     var currentScreen = Oobe.getInstance().currentScreen;
     if (currentScreen.id == SCREEN_GAIA_SIGNIN)
       chrome.send('showGaiaFrameError', [error]);
   };
 
   return {
     GaiaSigninScreen: GaiaSigninScreen
   };
 });