mash: Create system tray display and rotation lock items via delegate

chrome/browser/ui/ash/system_tray_delegate_chromeos.cc

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
index 1ba70edb392be3f5ab9605b464811595407a4abe..4dce95b19e0c8dcfdd27302abef7d3881ecaaff9 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
@@ -33,6 +33,8 @@
 #include "ash/common/wm_shell.h"
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
+#include "ash/system/chromeos/rotation/tray_rotation_lock.h"
+#include "ash/system/chromeos/tray_display.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/wm/lock_state_controller.h"
 #include "base/bind_helpers.h"
@@ -850,6 +852,16 @@ ash::VPNDelegate* SystemTrayDelegateChromeOS::GetVPNDelegate() const {
   return vpn_delegate_.get();
 }
 
+std::unique_ptr<ash::SystemTrayItem>
+SystemTrayDelegateChromeOS::CreateDisplayTrayItem(ash::SystemTray* tray) {
+  return base::MakeUnique<ash::TrayDisplay>(tray);
+}
+
+std::unique_ptr<ash::SystemTrayItem>
+SystemTrayDelegateChromeOS::CreateRotationLockTrayItem(ash::SystemTray* tray) {
+  return base::MakeUnique<ash::TrayRotationLock>(tray);
+}
+
 void SystemTrayDelegateChromeOS::UserAddedToSession(
     const user_manager::User* active_user) {
 }