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

chrome/browser/resources/user_manager/user_manager_tutorial.js

Index: chrome/browser/resources/user_manager/user_manager_tutorial.js
diff --git a/chrome/browser/resources/user_manager/user_manager_tutorial.js b/chrome/browser/resources/user_manager/user_manager_tutorial.js
index d4511dd4872461c442e004577b1fe8e7f2a6380e..be255c49f16b7a515504b3fe297e488ca91f5ac2 100644
--- a/chrome/browser/resources/user_manager/user_manager_tutorial.js
+++ b/chrome/browser/resources/user_manager/user_manager_tutorial.js
@@ -104,10 +104,18 @@ cr.define('cr.ui.login', function() {
   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';
+    }
   };
 
   /**