[cros] Fix 'Add user' button on WebUI lock screen.

chrome/browser/resources/chromeos/login/screen_account_picker.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 Account picker screen implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 21 matching lines @@
     },
 
     // Whether this screen is shown for the first time.
     firstShown_ : true,
 
     /**
      * Event handler that is invoked just before the frame is shown.
      * @param data {string} Screen init payload.
      */
     onBeforeShow: function(data) {
-      $('add-user-header-bar-item').hidden = false;
-      $('pod-row').handleShow();
+      var podRow = $('pod-row');
+      podRow.handleShow();
+
+      // If this is showing for the lock screen display the sign out button,
+      // hide the add user button and activate the locked user's pod.
+      var lockedPod = podRow.lockedPod;
+      $('add-user-header-bar-item').hidden = !!lockedPod;
+      $('sign-out-user-item').hidden = !lockedPod;
+      if (lockedPod)
+        podRow.focusPod(lockedPod);
+
       if (this.firstShown_) {
         this.firstShown_ = false;
         // TODO(nkostylev): Enable animation back when session start jank
         // is reduced. See http://crosbug.com/11116 http://crosbug.com/18307
         // $('pod-row').startInitAnimation();
 
         // TODO(altimofeev): Call it after animation has stoped when animation
         // is enabled.
         chrome.send('accountPickerReady', []);
       }
     },
 
      /**
       * Event handler that is invoked just before the frame is hidden.
       * @param data {string} Screen init payload.
       */
     onBeforeHide: function(data) {
       $('pod-row').handleHide();
     }
   };
 
   /**
    * Loads givens users in pod row.
    * @param {array} users Array of user.
    * @param {boolean} animated Whether to use init animation.
    * @public
    */
   AccountPickerScreen.loadUsers = function(users, animated) {
     $('pod-row').loadPods(users, animated);
-
-    // If this is showing for the lock screen display the sign out button, hide
-    // the add user button and activate the locked user's pod.
-    var lockedPod = $('pod-row').lockedPod;
-    $('add-user-header-bar-item').hidden = !!lockedPod;
-    $('sign-out-user-item').hidden = !lockedPod;
-    if (lockedPod)
-      lockedPod.activate();
   };
 
   /**
    * Updates current image of a user.
    * @param {string} email Email of the user for which to update the image.
    * @public
    */
   AccountPickerScreen.updateUserImage = function(email) {
     console.log('updateUserImage ' + email);
     $('pod-row').updateUserImage(email);
   };
 
   /**
    * Updates Caps Lock state (for Caps Lock hint in password input field).
    * @param {boolean} enabled Whether Caps Lock is on.
    * @public
    */
   AccountPickerScreen.setCapsLockState = function(enabled) {
     $('pod-row').classList[enabled ? 'add' : 'remove']('capslock-on');
   };
 
   return {
     AccountPickerScreen: AccountPickerScreen
   };
 });