Created new account type for ARC++ kiosk.

ash/common/login_status.h

Index: ash/common/login_status.h
diff --git a/ash/common/login_status.h b/ash/common/login_status.h
index 5b835d3f2612025b23a5bc648b664ce645564157..3083d430df2e50f8059b57aa8cd3b1753574b0f1 100644
--- a/ash/common/login_status.h
+++ b/ash/common/login_status.h
@@ -15,7 +15,8 @@ enum class LoginStatus {
   GUEST,          // A guest is logged in (i.e. incognito)
   PUBLIC,         // A public account is logged in
   SUPERVISED,     // A supervised user is logged in
-  KIOSK_APP       // Is in kiosk app mode
+  KIOSK_APP,      // Is in kiosk app mode
+  ARC_KIOSK_APP   // Is in ARC kiosk mode
 };
 
 }  // namespace ash