Add TrayLocale for locale change notifications.

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 99113877940e6d3bc69b85922abe487b6f55ce1f..08a2a79ec3851add94bbf29573c859f2c2a09b2d 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -25,6 +25,7 @@
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/tray_caps_lock.h"
+#include "ash/system/tray_locale.h"
 #include "ash/system/tray_update.h"
 #include "ash/system/user/login_status.h"
 #include "ash/system/user/tray_user.h"
@@ -161,6 +162,7 @@ SystemTray::SystemTray()
       clock_observer_(NULL),
       drive_observer_(NULL),
       ime_observer_(NULL),
+      locale_observer_(NULL),
       network_observer_(NULL),
       power_status_observer_(NULL),
       update_observer_(NULL),
@@ -212,6 +214,7 @@ void SystemTray::CreateItems() {
   internal::TrayCapsLock* tray_caps_lock = new internal::TrayCapsLock;
   internal::TrayDrive* tray_drive = new internal::TrayDrive;
   internal::TrayIME* tray_ime = new internal::TrayIME;
+  internal::TrayLocale* tray_locale = new internal::TrayLocale;
   internal::TrayUpdate* tray_update = new internal::TrayUpdate;
 
   accessibility_observer_ = tray_accessibility;
@@ -222,6 +225,7 @@ void SystemTray::CreateItems() {
   clock_observer_ = tray_date;
   drive_observer_ = tray_drive;
   ime_observer_ = tray_ime;
+  locale_observer_ = tray_locale;
   network_observer_ = tray_network;
   power_status_observer_ = tray_power;
   update_observer_ = tray_update;
@@ -233,6 +237,7 @@ void SystemTray::CreateItems() {
   AddTrayItem(tray_bluetooth);
   AddTrayItem(tray_drive);
   AddTrayItem(tray_ime);
+  AddTrayItem(tray_locale);
   AddTrayItem(tray_volume);
   AddTrayItem(tray_brightness);
   AddTrayItem(tray_update);