[Mac, Win] Show a user manager tutorial once per profile.

chrome/browser/resources/user_manager/user_manager_tutorial.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.
 
 cr.define('cr.ui.login', function() {
   /**
    * Constructs a slide manager for the user manager tutorial.
    *
    * @constructor
    */
@@ skipping 86 matching lines @@
           this.handleAddUserClick_.bind(this));
     }
   };
 
   /**
    * Initializes the tutorial manager.
    */
   UserManagerTutorial.startTutorial = function() {
     $('user-manager-tutorial').hidden = false;
 
-    // Disable interacting with the pods while the tutorial is showing.
-    $('pod-row').focusPod();  // No focused pods.
-    $('inner-container').style.opacity = '0.4';
-    $('inner-container').style.pointerEvents = 'none';
+    // If there's only one pod, show the slides to the side of the pod.
+    // Otherwise, center the slides and disable interacting with the pods
+    // while the tutorial is showing.
+    if ($('pod-row').pods.length == 1) {
+      $('slide-welcome').classList.add('single-pod');
+      $('slide-your-chrome').classList.add('single-pod');
+      $('slide-complete').classList.add('single-pod');
+    } else {
+      $('pod-row').focusPod();  // No focused pods.
+      $('inner-container').style.opacity = '0.4';

[Nikita (slow), 2014/03/14 17:30:35]

nit: Please define a separate CSS class rule and just set it here.

[noms (inactive), 2014/03/14 18:24:36]

Done. Added a style to screen-container.css
On 2014/03/14 17:30:35, Nikita Kostylev wrote:

+      $('inner-container').style.pointerEvents = 'none';
+    }
   };
 
   /**
    * Initializes the tutorial manager.
    */
   UserManagerTutorial.initialize = function() {
     UserManagerTutorial.getInstance().decorate();
   };
 
   // Export.
   return {
     UserManagerTutorial: UserManagerTutorial
   };
 });