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

ash/common/system/tray/system_tray.cc

Index: ash/common/system/tray/system_tray.cc
diff --git a/ash/common/system/tray/system_tray.cc b/ash/common/system/tray/system_tray.cc
index 7e5c239d276866b2d13ee623da9702dd81def050..655539df265e13883de9a48017d53f98ea009fab 100644
--- a/ash/common/system/tray/system_tray.cc
+++ b/ash/common/system/tray/system_tray.cc
@@ -538,8 +538,11 @@ void SystemTray::ShowItems(const std::vector<SystemTrayItem*>& items,
                            BubbleCreationType creation_type,
                            bool persistent) {
   // No system tray bubbles in kiosk mode.
-  if (WmShell::Get()->system_tray_delegate()->GetUserLoginStatus() ==
-      LoginStatus::KIOSK_APP) {
+  SystemTrayDelegate* system_tray_delegate =
+      WmShell::Get()->system_tray_delegate();
+  if (system_tray_delegate->GetUserLoginStatus() == LoginStatus::KIOSK_APP ||
+      system_tray_delegate->GetUserLoginStatus() ==
+          LoginStatus::ARC_KIOSK_APP) {
     return;
   }