exo: Use WMHelper to access ash accessibility related features.

components/exo/wm_helper_mus.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_mus.h"
 
 #include "services/ui/public/cpp/window_tree_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
@@ skipping 82 matching lines @@
 
 void WMHelperMus::RemovePostTargetHandler(ui::EventHandler* handler) {
   aura::Env::GetInstance()->RemovePostTargetHandler(handler);
 }
 
 bool WMHelperMus::IsMaximizeModeWindowManagerEnabled() const {
   NOTIMPLEMENTED();
   return false;
 }
 
+bool WMHelperMus::IsSpokenFeedbackEnabled() const {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+void WMHelperMus::PlayEarcon(int sound_key) const {
+  NOTIMPLEMENTED();
+}
+
 void WMHelperMus::OnWindowTreeFocusChanged(ui::Window* gained_focus,
                                            ui::Window* lost_focus) {
   aura::Window* gained_active =
       gained_focus ? GetToplevelAuraWindow(gained_focus) : nullptr;
   aura::Window* lost_active =
       lost_focus ? GetToplevelAuraWindow(lost_focus) : nullptr;
 
   // Because NativeWidgetMus uses separate FocusClient for every toplevel
   // window, we have to stop observering the FocusClient of the |lost_active|
   // and start observering the FocusClient of the |gained_active|.
@@ skipping 20 matching lines @@
 
 void WMHelperMus::OnWindowFocused(aura::Window* gained_focus,
                                   aura::Window* lost_focus) {
   if (focused_window_ != gained_focus) {
     focused_window_ = gained_focus;
     NotifyWindowFocused(gained_focus, lost_focus);
   }
 }
 
 }  // namespace exo