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/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image_skia.h"
 
+class CustodianInfoTrayObserver;
+
 namespace base {
 class TimeDelta;
 class TimeTicks;
 }
 
 namespace ash {
 
 struct ASH_EXPORT NetworkIconInfo {
   NetworkIconInfo();
   ~NetworkIconInfo();
@@ skipping 259 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 AddCustodianInfoChangedObserver(
+      base::WeakPtr<CustodianInfoTrayObserver> observer) {

[Daniel Erat, 2014/10/06 15:45:58]

what's the lifetime of the observer relative to this class?

i was suggesting not using weak pointers at all here. the usual pattern is that
class A outlives its observer class B. B calls A::AddObserver(this) in its c'tor
and A::RemoveObserver(this) in its d'tor.

+  };
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_