ash uber tray: Allow customizing each item depending on whether the user is logged in or not.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 519c9eef4907c13197eb9b588909b22a4ef5ab50..df2e8b05022e4653f502053d8b45b5240075f4bd 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -22,7 +22,7 @@
 #include "ash/system/power/tray_power_date.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray.h"
-#include "ash/system/tray_user.h"
+#include "ash/system/user/tray_user.h"
 #include "ash/tooltips/tooltip_controller.h"
 #include "ash/wm/activation_controller.h"
 #include "ash/wm/base_layout_manager.h"
@@ -205,6 +205,10 @@ class DummySystemTrayDelegate : public SystemTrayDelegate {
     return null_image_;
   }
 
+  virtual user::LoginStatus GetUserLoginStatus() OVERRIDE {
+    return user::LOGGED_IN_USER;
+  }
+
   virtual void ShowSettings() OVERRIDE {
   }