Convert TrayAccessibility to wm common types

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/update/update_observer.h"
 
 namespace ash {
 
 WmSystemTrayNotifier::WmSystemTrayNotifier() {}
 
 WmSystemTrayNotifier::~WmSystemTrayNotifier() {}
 
+void WmSystemTrayNotifier::AddAccessibilityObserver(
+    AccessibilityObserver* observer) {
+  accessibility_observers_.AddObserver(observer);
+}
+
+void WmSystemTrayNotifier::RemoveAccessibilityObserver(
+    AccessibilityObserver* observer) {
+  accessibility_observers_.RemoveObserver(observer);
+}
+
 void WmSystemTrayNotifier::AddClockObserver(ClockObserver* observer) {
   clock_observers_.AddObserver(observer);
 }
 
 void WmSystemTrayNotifier::RemoveClockObserver(ClockObserver* observer) {
   clock_observers_.RemoveObserver(observer);
 }
 
 void WmSystemTrayNotifier::AddUpdateObserver(UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void WmSystemTrayNotifier::RemoveUpdateObserver(UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }
 
+void WmSystemTrayNotifier::NotifyAccessibilityModeChanged(
+    ui::AccessibilityNotificationVisibility notify) {
+  FOR_EACH_OBSERVER(AccessibilityObserver, accessibility_observers_,
+                    OnAccessibilityModeChanged(notify));
+}
+
 void WmSystemTrayNotifier::NotifyRefreshClock() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_, Refresh());
 }
 
 void WmSystemTrayNotifier::NotifyDateFormatChanged() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_, OnDateFormatChanged());
 }
 
 void WmSystemTrayNotifier::NotifySystemClockTimeUpdated() {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_,
                     OnSystemClockTimeUpdated());
 }
 
 void WmSystemTrayNotifier::NotifySystemClockCanSetTimeChanged(
     bool can_set_time) {
   FOR_EACH_OBSERVER(ClockObserver, clock_observers_,
                     OnSystemClockCanSetTimeChanged(can_set_time));
 }
 
 void WmSystemTrayNotifier::NotifyUpdateRecommended(const UpdateInfo& info) {
   FOR_EACH_OBSERVER(UpdateObserver, update_observers_,
                     OnUpdateRecommended(info));
 }
 
 }  // namespace ash