migrate part of painting to nullsafety (#62696)
* migrate part of painting to nullsafety * address review comments * address review comment
A
Alexandre Ardhuin committed
4518a72ffdc84ad950ae85749dcab02352e1ebc4
Parent: fbd6dd6
Committed by GitHub <noreply@github.com>
on 8/4/2020, 3:26:00 PM