Initial implementation of new-style notification

ui/arc/notification/arc_notification_item_impl.cc

Index: ui/arc/notification/arc_notification_item_impl.cc
diff --git a/ui/arc/notification/arc_notification_item_impl.cc b/ui/arc/notification/arc_notification_item_impl.cc
index 610b4e18fdba29807e92e422e48db3cf9b8ffe3b..18ac549fcee3bf88eb78d2cb5a446fce6aa2d362 100644
--- a/ui/arc/notification/arc_notification_item_impl.cc
+++ b/ui/arc/notification/arc_notification_item_impl.cc
@@ -77,8 +77,14 @@ void ArcNotificationItemImpl::OnUpdatedFromAndroid(
   rich_data.priority = ConvertAndroidPriority(data->priority);
   if (data->small_icon)
     rich_data.small_image = gfx::Image::CreateFrom1xBitmap(*data->small_icon);
-  if (data->accessible_name.has_value())
-    rich_data.accessible_name = base::UTF8ToUTF16(*data->accessible_name);
+  if (data->accessible_name.has_value()) {
+    accessible_name_ = base::UTF8ToUTF16(*data->accessible_name);
+  } else {
+    accessible_name_ = base::JoinString(
+        {base::UTF8ToUTF16(data->title), base::UTF8ToUTF16(data->message)},
+        base::ASCIIToUTF16("\n"));
+  }
+  rich_data.accessible_name = accessible_name_;
 
   message_center::NotifierId notifier_id(
       message_center::NotifierId::SYSTEM_COMPONENT, kNotifierId);
@@ -195,4 +201,8 @@ const std::string& ArcNotificationItemImpl::GetNotificationId() const {
   return notification_id_;
 }
 
+const base::string16& ArcNotificationItemImpl::GetAccessibleName() const {
+  return accessible_name_;
+}
+
 }  // namespace arc