Adding infrastructure for possibility of changing manager names for the supervised accounts.

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>
 
 #include "ash/ash_export.h"
 #include "ash/system/user/login_status.h"
+#include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/i18n/time_formatting.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace base {
 class TimeDelta;
 class TimeTicks;
 }
 
 namespace ash {
 
+class CustodianInfoTrayObserver;
+
 struct ASH_EXPORT NetworkIconInfo {
   NetworkIconInfo();
   ~NetworkIconInfo();
 
   bool highlight() const { return connected || connecting; }
 
   bool connecting;
   bool connected;
   bool tray_icon_visible;
   gfx::ImageSkia image;
@@ skipping 252 matching lines @@
   // to be switched to the new user.
   // Note: This will happen after SessionStateObserver::ActiveUserChanged fires.
   virtual void ActiveUserWasChanged() = 0;
 
   // Returns true when the Search key is configured to be treated as Caps Lock.
   virtual bool IsSearchKeyMappedToCapsLock() = 0;
 
   // Returns accounts delegate for given user.
   virtual tray::UserAccountsDelegate* GetUserAccountsDelegate(
       const std::string& user_id) = 0;
+
+  // Adding observers that are notified when supervised info is being changed.
+  virtual void AddObserver(CustodianInfoTrayObserver* observer) {

[Daniel Erat, 2014/10/07 16:16:00]

any reason these aren't abstract like all the other methods in this interface?

[merkulova, 2014/10/08 09:19:37]

I don't want to clutter default_system_tray_delegate and
system_tray_delegate_linux with cloned empty unused methods.

+  };
+
+  virtual void RemoveObserver(CustodianInfoTrayObserver* observer) {
+  };
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_