Debug "failed do deserialize"

ui/login/account_picker/screen_account_picker.js

 // Copyright 2014 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.
  */
 
 login.createScreen('AccountPickerScreen', 'account-picker', function() {
   /**
@@ skipping 269 matching lines @@
         }
       }
     },
 
     /**
      * Loads given users in pod row.
      * @param {array} users Array of user.
      * @param {boolean} showGuest Whether to show guest session button.
      */
     loadUsers: function(users, showGuest) {
+      console.error("loadUsers: users:\n" + JSON.stringify(users,2,null));
       $('pod-row').loadPods(users);
       $('login-header-bar').showGuestButton = showGuest;
       // On Desktop, #login-header-bar has a shadow if there are 8+ profiles.
       if (Oobe.getInstance().displayType == DISPLAY_TYPE.DESKTOP_USER_MANAGER)
         $('login-header-bar').classList.toggle('shadow', users.length > 8);
 
       this.initializePinKeyboardStateForUsers_(users);
     },
 
     /**
@@ skipping 165 matching lines @@
      * @param {string} userID The user ID of the public session
      * @param {string} locale The locale to which this list of keyboard layouts
      *     applies
      * @param {!Object} list List of available keyboard layouts
      */
     setPublicSessionKeyboardLayouts: function(userID, locale, list) {
       $('pod-row').setPublicSessionKeyboardLayouts(userID, locale, list);
     }
   };
 });