Implements the dialog view for logout button tray in public sessions.

ash/system/tray/system_tray_notifier.cc

Index: ash/system/tray/system_tray_notifier.cc
diff --git a/ash/system/tray/system_tray_notifier.cc b/ash/system/tray/system_tray_notifier.cc
index e2035ad357feac1cf666d476d936a5477be47190..49d8e1f432c3d9c63ee4d93c60f97678320572cb 100644
--- a/ash/system/tray/system_tray_notifier.cc
+++ b/ash/system/tray/system_tray_notifier.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "ash/system/tray/system_tray_notifier.h"
+#include "base/time/time.h"

[bartfab (slow), 2013/12/10 12:41:16]

Nit 1: This is #included by the header file already.

Nit 2: The first #include (the one for the header of the class you are
implementing) should always be followed by a blank line.

[binjin, 2013/12/12 13:56:55]

Done.

 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/network/network_state_notifier.h"
@@ -232,6 +233,13 @@ void SystemTrayNotifier::NotifyShowLoginButtonChanged(bool show_login_button) {
                     OnShowLogoutButtonInTrayChanged(show_login_button));
 }
 
+void SystemTrayNotifier::NotifyLogoutDialogDurationChanged(
+    base::TimeDelta duration) {
+  FOR_EACH_OBSERVER(LogoutButtonObserver,
+                    logout_button_observers_,
+                    OnLogoutDialogDurationChanged(duration));
+}
+
 void SystemTrayNotifier::NotifyLocaleChanged(
     LocaleObserver::Delegate* delegate,
     const std::string& cur_locale,