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

chrome/browser/ui/views/profile_chooser_view.cc

Index: chrome/browser/ui/views/profile_chooser_view.cc
diff --git a/chrome/browser/ui/views/profile_chooser_view.cc b/chrome/browser/ui/views/profile_chooser_view.cc
index 20c3b73c6e7ab32ffbe7d03f85cf1de60bb43848..2cef602517c195f4746f2c99202af5ae213ff912 100644
--- a/chrome/browser/ui/views/profile_chooser_view.cc
+++ b/chrome/browser/ui/views/profile_chooser_view.cc
@@ -18,7 +18,6 @@
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/signin/signin_promo.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/browser/ui/views/user_manager_view.h"
 #include "chrome/common/pref_names.h"
@@ -523,7 +522,15 @@ void ProfileChooserView::ButtonPressed(views::Button* sender,
       size_t active_index = avatar_menu_->GetActiveProfileIndex();
       profile_path = avatar_menu_->GetItemAt(active_index).profile_path;
     }
-    chrome::ShowUserManager(profile_path);
+
+    // Show the tutorial if it hasn't been shown before.
+    bool tutorial_shown = browser_->profile()->GetPrefs()->GetBoolean(

[Alexei Svitkine (slow), 2014/03/14 21:04:40]

Same comment about caching profile prefs pointer. Also, add a comment mentioning
the identical logic in the Mac code (and point back to this code from a comment
there).

[noms (inactive), 2014/03/17 21:52:23]

Done.

+        prefs::kProfileUserManagerTutorialShown);
+    if (!tutorial_shown) {
+      browser_->profile()->GetPrefs()->SetBoolean(
+          prefs::kProfileUserManagerTutorialShown, true);
+    }
+    UserManagerView::Show(profile_path, !tutorial_shown);
   } else if (sender == add_user_button_) {
     profiles::CreateAndSwitchToNewProfile(
         browser_->host_desktop_type(),