Add TraySms for SMS messages.

ash/system/tray/system_tray_item.cc

Index: ash/system/tray/system_tray_item.cc
diff --git a/ash/system/tray/system_tray_item.cc b/ash/system/tray/system_tray_item.cc
index ed5cdd25e4b548836fdd9db1430c030397918afd..91bc1ac0031442db14900ce22c22faa6a3f37576 100644
--- a/ash/system/tray/system_tray_item.cc
+++ b/ash/system/tray/system_tray_item.cc
@@ -44,6 +44,9 @@ void SystemTrayItem::DestroyDetailedView() {
 void SystemTrayItem::DestroyNotificationView() {
 }
 
+void SystemTrayItem::UpdateAfterLoginStatusChange(user::LoginStatus status) {
+}
+
 void SystemTrayItem::PopupDetailedView(int for_seconds, bool activate) {
   Shell::GetInstance()->tray()->ShowDetailedView(this, for_seconds, activate);
 }
@@ -52,6 +55,10 @@ void SystemTrayItem::SetDetailedViewCloseDelay(int for_seconds) {
   Shell::GetInstance()->tray()->SetDetailedViewCloseDelay(for_seconds);
 }
 
+void SystemTrayItem::HideDetailedView() {
+  Shell::GetInstance()->tray()->HideDetailedView(this);
+}
+
 void SystemTrayItem::ShowNotificationView() {
   Shell::GetInstance()->tray()->ShowNotificationView(this);
 }