Revert of Refactor backdrop

components/exo/wm_helper.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 "components/exo/wm_helper.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace exo {
 namespace {
@@ skipping 44 matching lines @@
 }
 
 void WMHelper::AddMaximizeModeObserver(MaximizeModeObserver* observer) {
   maximize_mode_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveMaximizeModeObserver(MaximizeModeObserver* observer) {
   maximize_mode_observers_.RemoveObserver(observer);
 }
 
+void WMHelper::AddAccessibilityObserver(AccessibilityObserver* observer) {
+  accessibility_observers_.AddObserver(observer);
+}
+
+void WMHelper::RemoveAccessibilityObserver(AccessibilityObserver* observer) {
+  accessibility_observers_.RemoveObserver(observer);
+}
+
 void WMHelper::AddInputDeviceEventObserver(InputDeviceEventObserver* observer) {
   input_device_event_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveInputDeviceEventObserver(
     InputDeviceEventObserver* observer) {
   input_device_event_observers_.RemoveObserver(observer);
 }
 
 void WMHelper::AddDisplayConfigurationObserver(
@@ skipping 36 matching lines @@
 void WMHelper::NotifyMaximizeModeEnding() {
   for (MaximizeModeObserver& observer : maximize_mode_observers_)
     observer.OnMaximizeModeEnding();
 }
 
 void WMHelper::NotifyMaximizeModeEnded() {
   for (MaximizeModeObserver& observer : maximize_mode_observers_)
     observer.OnMaximizeModeEnded();
 }
 
+void WMHelper::NotifyAccessibilityModeChanged() {
+  for (AccessibilityObserver& observer : accessibility_observers_)
+    observer.OnAccessibilityModeChanged();
+}
+
 void WMHelper::NotifyKeyboardDeviceConfigurationChanged() {
   for (InputDeviceEventObserver& observer : input_device_event_observers_)
     observer.OnKeyboardDeviceConfigurationChanged();
 }
 
 void WMHelper::NotifyDisplayConfigurationChanged() {
   for (DisplayConfigurationObserver& observer : display_config_observers_)
     observer.OnDisplayConfigurationChanged();
 }
 
 }  // namespace exo