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

ash/system/tray/system_tray_delegate.h

Index: ash/system/tray/system_tray_delegate.h
diff --git a/ash/system/tray/system_tray_delegate.h b/ash/system/tray/system_tray_delegate.h
index 4df2f70452f6576632d8df5c2b866bf3a2cf7272..6b7943afcbb0a3b9daab6d16d32494d942f5afa7 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -10,12 +10,16 @@
 
 #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;
@@ -295,6 +299,11 @@ class ASH_EXPORT SystemTrayDelegate {
   // 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