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

chromeos/login/auth/authenticator.h

Index: chromeos/login/auth/authenticator.h
diff --git a/chromeos/login/auth/authenticator.h b/chromeos/login/auth/authenticator.h
index 653672854ce25250f9a405aa161bf119b167a16c..90a6de395caad54d6796d188f609486a52c2bff2 100644
--- a/chromeos/login/auth/authenticator.h
+++ b/chromeos/login/auth/authenticator.h
@@ -65,6 +65,11 @@ class CHROMEOS_EXPORT Authenticator
   virtual void LoginAsKioskAccount(const AccountId& app_account_id,
                                    bool use_guest_mount) = 0;
 
+  // Initiates login into ARC kiosk mode account identified by |app_account_id|.
+  // The |app_account_id| is a generated account id for the account.
+  // ARC kiosk mode mounts a public cryptohome.
+  virtual void LoginAsArcKioskAccount(const AccountId& app_account_id) = 0;
+
   // Notifies caller that login was successful. Must be called on the UI thread.
   virtual void OnAuthSuccess() = 0;