Add LoginState class to src/chromeos/login

ash/system/user/login_status.h

 // 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.
 
 #ifndef ASH_SYSTEM_USER_LOGIN_STATUS_H_
 #define ASH_SYSTEM_USER_LOGIN_STATUS_H_
 
 #include "base/string16.h"
 
 namespace ash {
 namespace user {
 
 enum LoginStatus {
   LOGGED_IN_LOCKED,           // A user has locked the screen.
   LOGGED_IN_USER,             // A normal user is logged in.
   LOGGED_IN_OWNER,            // The owner of the device is logged in.
   LOGGED_IN_GUEST,            // A guest is logged in (i.e. incognito)
   LOGGED_IN_RETAIL_MODE,      // Is in retail mode.
   LOGGED_IN_PUBLIC,           // A public account is logged in.
-  LOGGED_IN_LOCALLY_MANAGED,  // A locally managed user is logged in.

[Nikita (slow), 2013/04/05 04:08:53]

Please leave LOGGED_IN_LOCALLY_MANAGED status as we most likely to configure
some UI elements based on that later.
If we end up not using it, I'll do a cleanup.

[stevenjb, 2013/04/05 18:17:15]

Ugh, another place where we were setting this in PowerButtonObserver, but not in
AshSystemTrayDelegate. Cleanup FTW. Done.

-  LOGGED_IN_KIOSK_APP,        // Is in kiosk app mode.

[bartfab (slow), 2013/04/05 13:16:33]

1/ Please leave the LOGGED_IN_KIOSK_APP status. This mode is still in flux,
which is why you do not see the status used anywhere yet.

2/ Nit: I presume that this constant means a kiosk app mode session is actually
running. A better comment would then be "Kiosk app session in progress."

3/ @xiyuan: I strongly object to yet another usage of "kiosk". It is way
overloaded already. Can we please rename this to something like
"LOGGED_IN_SINGLE_APP" for "single-app mode"?

[stevenjb, 2013/04/05 18:17:15]

I'm going to restore this to how it was, with any future renaming TBD by someone
who is familiar with it :)

   LOGGED_IN_NONE,             // Not logged in.
 };
 
 string16 GetLocalizedSignOutStringForStatus(LoginStatus status, bool multiline);
 
 }  // namespace user
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_LOGIN_STATUS_H_