ash: Add checks for supervised users.

ash/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_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 101 matching lines @@
   // Returns the display email of the user that manages the current supervised
   // user.
   virtual const std::string GetSupervisedUserManager() const = 0;
 
   // Returns the name of the user that manages the current supervised user.
   virtual const base::string16 GetSupervisedUserManagerName() const = 0;
 
   // Returns the notification for supervised users.
   virtual const base::string16 GetSupervisedUserMessage() const = 0;
 
+  // Returns true if the current user is supervised.
+  virtual bool IsUserSupervised() const = 0;
+
   // Returns whether a system upgrade is available.
   virtual bool SystemShouldUpgrade() const = 0;
 
   // Returns the desired hour clock type.
   virtual base::HourClockType GetHourClockType() const = 0;
 
   // Shows settings.
   virtual void ShowSettings() = 0;
 
   // Returns true if settings menu item should appear.
@@ skipping 164 matching lines @@
   virtual bool IsSearchKeyMappedToCapsLock() = 0;
 
   // Returns accounts delegate for given user.
   virtual tray::UserAccountsDelegate* GetUserAccountsDelegate(
       const std::string& user_id) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_