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..96b339e59131f87cdfcffaba4de14c239efeae93 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -10,6 +10,7 @@
 
 #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"
@@ -23,6 +24,8 @@ class TimeTicks;
 
 namespace ash {
 
+class CustodianInfoTrayObserver;
+
 struct ASH_EXPORT NetworkIconInfo {
   NetworkIconInfo();
   ~NetworkIconInfo();
@@ -295,6 +298,13 @@ 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 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