Add TrayLocale for locale change notifications.

ash/system/tray_locale.h

+// 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_TRAY_LOCALE_H_
+#define ASH_SYSTEM_TRAY_LOCALE_H_
+#pragma once
+
+#include <string>
+
+#include "ash/system/tray/tray_image_item.h"
+
+namespace ash {
+
+class ASH_EXPORT LocaleChangeDelegate {

[sadrul, 2012/05/17 03:15:44]

LocaleChangeDelegate and LocaleObserver could move into different files.

[stevenjb, 2012/05/17 16:58:57]

Fair point. 
Created a locale/ subdirectory
Moved this and locale_observer.h to system/locale
Made Delegate a member of LocaleObserver.

+ public:
+  virtual ~LocaleChangeDelegate() {}
+
+  virtual void AcceptLocaleChange() = 0;
+  virtual void RevertLocaleChange() = 0;
+};
+
+class ASH_EXPORT LocaleObserver {
+ public:
+  virtual ~LocaleObserver() {}
+
+  virtual void OnLocaleChanged(LocaleChangeDelegate* delegate,
+                               const std::string& cur_locale,
+                               const std::string& from_locale,
+                               const std::string& to_locale) = 0;
+};
+
+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(LocaleChangeDelegate* delegate,
+                               const std::string& cur_locale,
+                               const std::string& from_locale,
+                               const std::string& to_locale) OVERRIDE;
+
+  tray::LocaleNotificationView* notification_;
+  LocaleChangeDelegate* 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_TRAY_LOCALE_H_