We don't invalidate enough when a box having mask is resized.
Sorry for lacking details when filing this bug. I don't remember the exact case. This might have been fixed by https://chromium.googlesource.com/chromium/src/+/3076aa222b62ac770f2c887bc11b7e246fe5b063.
Comment 1 by wangxianzhu@chromium.org
, Apr 21 2017