When the Sign in page is shown, speak the title if accessibility is turned on

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

 // Copyright (c) 2011 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() {
 
@@ skipping 99 matching lines @@
       var url = data.startUrl;
       if (params.length)
         url += '?' + params.join('&');
 
       $('signin-frame').src = url;
       this.extension_url_ = url;
 
       $('createAccount').hidden = !data.createAccount;
       $('guestSignin').hidden = !data.guestSignin;
 
+      // Announce the name of the screen, if accessibility is on.
+      $('gaia-signin-aria-label').setAttribute(
+          'aria-label', localStrings.getString('signinScreenTitle'));
+
       this.loading = true;
     },
 
     /**
      * Checks if message comes from the loaded authentication extension.
      * @param e {object} Payload of the received HTML5 message.
      * @type {bool}
      */
     isAuthExtMessage_: function(e) {
       return this.extension_url_ != null &&
@@ skipping 27 matching lines @@
       // Reload and show the sign-in UI if needed.
       if (takeFocus)
         Oobe.showSigninUI();
     }
   };
 
   return {
     GaiaSigninScreen: GaiaSigninScreen
   };
 });