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 fbdd95348afb54b27499b5e616a03a02a22d0da8..badd42cd9dff53763341f1488e05e2b5d6992a4e 100644
--- a/ash/common/system/overview/overview_button_tray.cc
+++ b/ash/common/system/overview/overview_button_tray.cc
@@ -152,7 +152,9 @@ 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