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

ash/common/system/overview/overview_button_tray.cc

Index: ash/common/system/overview/overview_button_tray.cc
diff --git a/ash/common/system/overview/overview_button_tray.cc b/ash/common/system/overview/overview_button_tray.cc
index f88134f04213d3c94ee58a0624651ae6f70a7d93..0b67e14ec446a4fd68f8406de1efbde046d38f97 100644
--- a/ash/common/system/overview/overview_button_tray.cc
+++ b/ash/common/system/overview/overview_button_tray.cc
@@ -147,7 +147,9 @@ void OverviewButtonTray::UpdateIconVisibility() {
       session_state_delegate->GetSessionState() ==
           session_manager::SessionState::ACTIVE &&
       shell->system_tray_delegate()->GetUserLoginStatus() !=
-          LoginStatus::KIOSK_APP);
+          LoginStatus::KIOSK_APP &&
+      shell->system_tray_delegate()->GetUserLoginStatus() !=
+          LoginStatus::ARC_KIOSK_APP);
 }
 
 }  // namespace ash