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

ash/system/brightness/tray_brightness.cc

Index: ash/system/brightness/tray_brightness.cc
diff --git a/ash/system/brightness/tray_brightness.cc b/ash/system/brightness/tray_brightness.cc
index 655c373be8bb2bbd0f7e5cd962ee00afb0a4c8f0..331866903ec51bd7849087cc728bfb077c17de42 100644
--- a/ash/system/brightness/tray_brightness.cc
+++ b/ash/system/brightness/tray_brightness.cc
@@ -83,16 +83,16 @@ TrayBrightness::TrayBrightness() {}
 
 TrayBrightness::~TrayBrightness() {}
 
-views::View* TrayBrightness::CreateTrayView() {
+views::View* TrayBrightness::CreateTrayView(user::LoginStatus status) {
   return NULL;
 }
 
-views::View* TrayBrightness::CreateDefaultView() {
+views::View* TrayBrightness::CreateDefaultView(user::LoginStatus status) {
   brightness_view_.reset(new tray::BrightnessView);
   return brightness_view_.get();
 }
 
-views::View* TrayBrightness::CreateDetailedView() {
+views::View* TrayBrightness::CreateDetailedView(user::LoginStatus status) {
   brightness_view_.reset(new tray::BrightnessView);
   return brightness_view_.get();
 }