Adding "UserAddedToSession" notifier to the SessionStateObserver

chrome/browser/ui/ash/session_state_delegate_chromeos.cc

Index: chrome/browser/ui/ash/session_state_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
index 154df7fcc4dfb071d45df2119d48f192da012d3e..f68cc84d7c3147de84a707de3cc1802e638df5ce 100644
--- a/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.cc
@@ -164,3 +164,10 @@ void SessionStateDelegateChromeos::ActiveUserChanged(
                     session_state_observer_list_,
                     ActiveUserChanged(active_user->email()));
 }
+
+void SessionStateDelegateChromeos::UserAddedToSession(
+    const chromeos::User* added_user) {
+  FOR_EACH_OBSERVER(ash::SessionStateObserver,
+                    session_state_observer_list_,
+                    UserAddedToSession(added_user->email()));
+}