This took me about 5 seconds to find: https://bugs.chromium.org/p/skia/issues/list via https://skia.org/docs/dev/contrib/#report-bugs.

> I'm not even really sure what Google does in open source.

Kubernetes (and a bunch of the offshoots), golang, a bunch of ML things, etc. It's just that many have independent foundations (CNCF) running them now to keep project management independent from a single company.