Remember and restore the account last used destination is registered for.

chrome/browser/resources/print_preview/data/user_info.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Repository which stores information about the user. Events are dispatched
    * when the information changes.
    * @constructor
    * @extends {cr.EventTarget}
    */
   function UserInfo() {
     cr.EventTarget.call(this);
 
     /**
      * Email address of the logged in user or {@code null} if no user is logged
      * in. In case of Google multilogin, can be changed by the user.
      * @private {?string}
      */
     this.activeUser_ = null;
 
     /**
      * Email addresses of the logged in users or empty array if no user is
-     * logged in.
-     * @private {!Array.<string>}
+     * logged in. {@code null} if not known yet.
+     * @private {?Array.<string>}
      */
-    this.users_ = [];
+    this.users_ = null;
   };
 
   /**
    * Enumeration of event types dispatched by the user info.
    * @enum {string}
    */
   UserInfo.EventType = {
     ACTIVE_USER_CHANGED: 'print_preview.UserInfo.ACTIVE_USER_CHANGED',
     USERS_CHANGED: 'print_preview.UserInfo.USERS_CHANGED'
   };
 
   UserInfo.prototype = {
     __proto__: cr.EventTarget.prototype,
 
+    /** @return {boolean} Whether user accounts are already retrieved. */
+    get initialized() {
+      return this.users_ != null;
+    },
+
+    /** @return {boolean} Whether user is logged in or not. */
+    get loggedIn() {
+      return !!this.activeUser;
+    },
+
     /**
      * @return {?string} Email address of the logged in user or {@code null} if
      *     no user is logged.
      */
     get activeUser() {
       return this.activeUser_;
     },
 
     /** Changes active user. */
     set activeUser(activeUser) {
       if (this.activeUser_ != activeUser) {
         this.activeUser_ = activeUser;
         cr.dispatchSimpleEvent(this, UserInfo.EventType.ACTIVE_USER_CHANGED);
       }
     },
 
-
     /**
-     * @return {!Array.<string>} Email addresses of the logged in users or
-     *     empty array if no user is logged in.
+     * @return {?Array.<string>} Email addresses of the logged in users or
+     *     empty array if no user is logged in. {@code null} if not known yet.
      */
     get users() {
       return this.users_;
     },
 
     /**
      * Sets logged in user accounts info.
-     * @param {string} user Currently logged in user (email).
+     * @param {string} activeUser Active user account (email).
      * @param {!Array.<string>} users List of currently logged in accounts.
      */
     setUsers: function(activeUser, users) {
       this.activeUser_ = activeUser;
       this.users_ = users || [];
       cr.dispatchSimpleEvent(this, UserInfo.EventType.USERS_CHANGED);
     },
   };
 
   return {
     UserInfo: UserInfo
   };
 });