See build log
Created attachment 744393 [details] buildlog
Created attachment 744396 [details] emerge --info chromium emerge --info chromium
Hm, I would've expected https://github.com/gentoo/gentoo/commit/cdccf09cb37bce1cdb93797ab54ce474d0fff0b3 to be sufficient..
And I don't see that patch being applied. Can you emerge --sync and try again?
Looks like the patches to chromium came in on a later sync. Building now and no issues so far. Also Scribus and qtwebengine built overnight. The harfbuzz update triggered some very long rebuilds and it taking around 18hr or so.
Chromium built with harfbuzz-3.0.0 given the new patches