exo: Use WMHelper to access ash accessibility related features.

components/exo/wm_helper_ash.cc

Index: components/exo/wm_helper_ash.cc
diff --git a/components/exo/wm_helper_ash.cc b/components/exo/wm_helper_ash.cc
index 1a646132e124679c08a8ba5d2554043f9e4f034e..21a085fd4b42a942bd5363dd9c818261a4b1932d 100644
--- a/components/exo/wm_helper_ash.cc
+++ b/components/exo/wm_helper_ash.cc
@@ -4,6 +4,7 @@
 
 #include "components/exo/wm_helper_ash.h"
 
+#include "ash/common/accessibility_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/display/display_manager.h"
@@ -89,6 +90,16 @@ bool WMHelperAsh::IsMaximizeModeWindowManagerEnabled() const {
       ->IsMaximizeModeWindowManagerEnabled();
 }
 
+bool WMHelperAsh::IsSpokenFeedbackEnabled() const {
+  return ash::WmShell::Get()
+      ->accessibility_delegate()
+      ->IsSpokenFeedbackEnabled();
+}
+
+void WMHelperAsh::PlayEarcon(int sound_key) const {
+  return ash::WmShell::Get()->accessibility_delegate()->PlayEarcon(sound_key);
+}
+
 void WMHelperAsh::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
@@ -109,6 +120,11 @@ void WMHelperAsh::OnCursorSetChanged(ui::CursorSetType cursor_set) {
   NotifyCursorSetChanged(cursor_set);
 }
 
+void WMHelperAsh::OnAccessibilityModeChanged(
+    ash::AccessibilityNotificationVisibility notify) {
+  NotifyAccessibilityModeChanged();
+}
+
 void WMHelperAsh::OnMaximizeModeStarted() {
   NotifyMaximizeModeStarted();
 }