Create a dialog that warns about possible UI-oddities of the multi-profiles window teleport

chrome/browser/chromeos/login/multi_profile_first_run_notification.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chromeos/login/multi_profile_first_run_notification.h"
 
 #include "ash/system/system_notifier.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ skipping 52 matching lines @@
 void MultiProfileFirstRunNotification::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kMultiProfileNotificationDismissed,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kMultiProfileNeverShowIntro,
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(
+      prefs::kMultiProfileWarningShowDismissed,
+      false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 void MultiProfileFirstRunNotification::UserProfilePrepared(
     Profile* user_profile) {
   if (!UserManager::IsMultipleProfilesAllowed() ||
       UserManager::Get()->GetLoggedInUsers().size() > 1 ||
       user_profile->GetPrefs()->GetBoolean(
           prefs::kMultiProfileNotificationDismissed)) {
     return;
   }
@@ skipping 19 matching lines @@
   notification->SetSystemPriority();
   message_center::MessageCenter::Get()->AddNotification(notification.Pass());
 }
 
 void MultiProfileFirstRunNotification::OnDismissed(Profile* user_profile) {
   user_profile->GetPrefs()->SetBoolean(
       prefs::kMultiProfileNotificationDismissed, true);
 }
 
 }  // namespace chromeos