mash: Migrate locale observer and notification to common.

ash/common/system/tray/wm_system_tray_notifier.cc

 // Copyright 2016 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.
 
 #include "ash/common/system/tray/wm_system_tray_notifier.h"
 
 #include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/date/clock_observer.h"
 #include "ash/common/system/ime/ime_observer.h"
 #include "ash/common/system/update/update_observer.h"
@@ skipping 61 matching lines @@
 
 void WmSystemTrayNotifier::NotifyRefreshIME() {
   FOR_EACH_OBSERVER(IMEObserver, ime_observers_, OnIMERefresh());
 }
 
 void WmSystemTrayNotifier::NotifyRefreshIMEMenu(bool is_active) {
   FOR_EACH_OBSERVER(IMEObserver, ime_observers_,
                     OnIMEMenuActivationChanged(is_active));
 }
 
+void WmSystemTrayNotifier::AddLocaleObserver(LocaleObserver* observer) {
+  locale_observers_.AddObserver(observer);
+}
+
+void WmSystemTrayNotifier::RemoveLocaleObserver(LocaleObserver* observer) {
+  locale_observers_.RemoveObserver(observer);
+}
+
+void WmSystemTrayNotifier::NotifyLocaleChanged(
+    LocaleObserver::Delegate* delegate,
+    const std::string& cur_locale,
+    const std::string& from_locale,
+    const std::string& to_locale) {
+  FOR_EACH_OBSERVER(
+      LocaleObserver, locale_observers_,
+      OnLocaleChanged(delegate, cur_locale, from_locale, to_locale));
+}
+
 void WmSystemTrayNotifier::AddUpdateObserver(UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void WmSystemTrayNotifier::RemoveUpdateObserver(UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }
 
 void WmSystemTrayNotifier::NotifyUpdateRecommended(const UpdateInfo& info) {
   FOR_EACH_OBSERVER(UpdateObserver, update_observers_,
@@ skipping 14 matching lines @@
 
 void WmSystemTrayNotifier::NotifyVirtualKeyboardSuppressionChanged(
     bool suppressed) {
   FOR_EACH_OBSERVER(VirtualKeyboardObserver, virtual_keyboard_observers_,
                     OnKeyboardSuppressionChanged(suppressed));
 }
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace ash