A11y setting: mono audio UI

ash/default_accessibility_delegate.cc

Index: ash/default_accessibility_delegate.cc
diff --git a/ash/default_accessibility_delegate.cc b/ash/default_accessibility_delegate.cc
index 402e5b59f38676ed4881124b6e49a0616ce19f3f..b74ff090f7411370caa612472010a5118fe2dde4 100644
--- a/ash/default_accessibility_delegate.cc
+++ b/ash/default_accessibility_delegate.cc
@@ -64,6 +64,14 @@ bool DefaultAccessibilityDelegate::IsVirtualKeyboardEnabled() const {
   return virtual_keyboard_enabled_;
 }
 
+void DefaultAccessibilityDelegate::SetMonoAudioEnabled(bool enabled) {
+  mono_audio_enabled_ = enabled;
+}
+
+bool DefaultAccessibilityDelegate::IsMonoAudioEnabled() const {
+  return mono_audio_enabled_;
+}
+
 void DefaultAccessibilityDelegate::SetCaretHighlightEnabled(bool enabled) {
   caret_highlight_enabled_ = enabled;
 }
@@ -110,7 +118,8 @@ bool DefaultAccessibilityDelegate::ShouldShowAccessibilityMenu() const {
          screen_magnifier_enabled_ ||
          large_cursor_enabled_ ||
          autoclick_enabled_ ||
-         virtual_keyboard_enabled_;
+         virtual_keyboard_enabled_ ||
+         mono_audio_enabled_;
 }
 
 bool DefaultAccessibilityDelegate::IsBrailleDisplayConnected() const {