arc: Make notifications from Android read by ChromeVox.

ui/arc/notification/arc_custom_notification_item.cc

Index: ui/arc/notification/arc_custom_notification_item.cc
diff --git a/ui/arc/notification/arc_custom_notification_item.cc b/ui/arc/notification/arc_custom_notification_item.cc
index 79e4a9a858914504661bbfadeb8144cdeedbc406..e4c582c73632a3497c8b591ffc30db4270019bce 100644
--- a/ui/arc/notification/arc_custom_notification_item.cc
+++ b/ui/arc/notification/arc_custom_notification_item.cc
@@ -65,6 +65,8 @@ void ArcCustomNotificationItem::UpdateWithArcNotificationData(
   rich_data.pinned = (data.no_clear || data.ongoing_event);
   rich_data.priority = ConvertAndroidPriority(data.priority);
   rich_data.small_image = ConvertAndroidSmallIcon(data.small_icon);
+  if (!data.accessible_name.is_null())
+    rich_data.accessible_name = base::UTF8ToUTF16(data.accessible_name.get());
 
   message_center::NotifierId notifier_id(
       message_center::NotifierId::SYSTEM_COMPONENT, kNotifierId);