A11y setting: mono audio UI

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index bee0a4d8457ba098956138316e9609adb099f71f..049868abc1e89b8a664d04c2538238a3f1484b82 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -592,6 +592,10 @@ const char kAccessibilityScreenMagnifierScale[] =
 // due to lack of a physical keyboard.
 const char kAccessibilityVirtualKeyboardEnabled[] =
     "settings.a11y.virtual_keyboard";
+// A boolean pref which determines whether the mono audio output is enabled for
+// accessibility.
+const char kAccessibilityMonoAudioEnabled[] =
+    "settings.a11y.mono_audio";
 // A boolean pref which determines whether autoclick is enabled.
 const char kAccessibilityAutoclickEnabled[] = "settings.a11y.autoclick";
 // An integer pref which determines time in ms between when the mouse cursor