Add ARC++ kiosk menu items and ability to start kiosk session.

components/user_manager/user_manager_base.h

Index: components/user_manager/user_manager_base.h
diff --git a/components/user_manager/user_manager_base.h b/components/user_manager/user_manager_base.h
index df206121af7f706f0436c6f11defdb3f954e29e8..3c479f17b1f4575a45902e87dc2048900a462aff 100644
--- a/components/user_manager/user_manager_base.h
+++ b/components/user_manager/user_manager_base.h
@@ -222,6 +222,9 @@ class USER_MANAGER_EXPORT UserManagerBase : public UserManager {
   // Indicates that a kiosk app robot just logged in.
   virtual void KioskAppLoggedIn(User* user) = 0;
 
+  // Indicates that an ARC kiosk app robot just logged in.
+  virtual void ArcKioskAppLoggedIn(User* user) = 0;
+
   // Indicates that a user just logged into a public session.
   virtual void PublicAccountUserLoggedIn(User* user) = 0;