This is related to crbug/870606
Using per-frame task runners is necessary to assure that JavaScript is executed only on per-frame task runners, which is necessary for bfcache.
This issue has an owner, a component and a priority, but is still listed as untriaged or unconfirmed. By definition, this bug is triaged. Changing status to "assigned". Please reach out to me if you disagree with how I've done this.
Comment 1 by hajimehoshi@chromium.org
, Dec 11