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

ash/common/system/tray/system_tray_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 11 matching lines @@
 
 namespace base {
 class TimeDelta;
 class TimeTicks;
 }
 
 namespace ash {
 
 class CustodianInfoTrayObserver;
 class ShutdownPolicyObserver;
+class SystemTray;
+class SystemTrayItem;
 
 struct ASH_EXPORT NetworkIconInfo {
   NetworkIconInfo();
   ~NetworkIconInfo();
 
   bool highlight() const { return connected || connecting; }
 
   bool connecting;
   bool connected;
   bool tray_icon_visible;
@@ skipping 286 matching lines @@
 
   virtual void RemoveShutdownPolicyObserver(ShutdownPolicyObserver* observer);
 
   // Determines whether the device is automatically rebooted when shut down as
   // specified by the device policy |DeviceRebootOnShutdown|. This function
   // asynchronously calls |callback| once a trusted policy becomes available.
   virtual void ShouldRebootOnShutdown(const RebootOnShutdownCallback& callback);
 
   // Returns VPNDelegate. May return nullptr.
   virtual VPNDelegate* GetVPNDelegate() const;
+
+  // Creates a system tray item for display settings.
+  // TODO(jamescook): Remove this when mus has support for display management
+  // and we have a DisplayManager equivalent. See http://crbug.com/548429
+  virtual std::unique_ptr<SystemTrayItem> CreateDisplayTrayItem(
+      SystemTray* tray);
+
+  // Creates a system tray item for display rotation lock.
+  // TODO(jamescook): Remove this when mus has support for display management
+  // and we have a DisplayManager equivalent. See http://crbug.com/548429
+  virtual std::unique_ptr<SystemTrayItem> CreateRotationLockTrayItem(
+      SystemTray* tray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_