Add TrayLocale for locale change notifications.

ash/system/locale/tray_locale.h

Index: ash/system/locale/tray_locale.h
diff --git a/ash/system/locale/tray_locale.h b/ash/system/locale/tray_locale.h
new file mode 100644
index 0000000000000000000000000000000000000000..c0d114cc30ddfd09d9ba1b8f7b4ca1bdbd098ff6
--- /dev/null
+++ b/ash/system/locale/tray_locale.h
@@ -0,0 +1,52 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ASH_SYSTEM_LOCALE_TRAY_LOCALE_H_
+#define ASH_SYSTEM_LOCALE_TRAY_LOCALE_H_
+#pragma once
+
+#include <string>
+
+#include "ash/system/locale/locale_observer.h"
+#include "ash/system/tray/tray_image_item.h"
+
+namespace ash {
+namespace internal {
+
+namespace tray {
+class LocaleNotificationView;
+}
+
+class TrayLocale : public TrayImageItem,
+                   public LocaleObserver {
+ public:
+  TrayLocale();
+  virtual ~TrayLocale();
+
+ private:
+  // Overridden from TrayImageItem.
+  virtual bool GetInitialVisibility() OVERRIDE;
+  virtual views::View* CreateNotificationView(
+      user::LoginStatus status) OVERRIDE;
+  virtual void DestroyNotificationView() OVERRIDE;
+
+  // Overridden from LocaleObserver.
+  virtual void OnLocaleChanged(LocaleObserver::Delegate* delegate,
+                               const std::string& cur_locale,
+                               const std::string& from_locale,
+                               const std::string& to_locale) OVERRIDE;
+
+  tray::LocaleNotificationView* notification_;
+  LocaleObserver::Delegate* delegate_;
+  std::string cur_locale_;
+  std::string from_locale_;
+  std::string to_locale_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayLocale);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_LOCALE_TRAY_LOCALE_H_