I've deployed an emergency fix for the infinite bug comments:
https://chromium-review.googlesource.com/c/catapult/+/948266

And filed a bug:
https://github.com/catapult-project/catapult/issues/4307

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/129cf8a1440000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/15db5bd1440000

Kicking of a few more bisects.

+Dave, Simon any chance we could use the monorail API to get rid of all these comments?

Done.

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/129cf8a1440000

Remove WebTaskRunner::PostTask() for CrossThreadClosure. by yutak@chromium.org
https://chromium.googlesource.com/chromium/src/+/ef414c066331d7648d32d21da3b81f06e5058458

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

The CL just removes an unused function. There's no production code change, so
this bisect result doesn't really make sense.

Oh, yes, the reason why I hadn't re-run the bisect is because the partial results looked really noisy. frame_times is generally hard to bisect on.

📍 Found significant differences after each of 3 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/15db5bd1440000

S13nServiceWorker: Call OnNoWork when all stream responses finish by shimazu@chromium.org
https://chromium.googlesource.com/chromium/src/+/cad7fcc1c6659e192ac78d5c4f7dd18e21d4dfae

[oilpan] HeapHashSet add support for incremental marking by mlippautz@chromium.org
https://chromium.googlesource.com/chromium/src/+/07a928267fc62ea5d747a2323dc0244546a70da7

Shift extension API code to using Mojo CookieManager interface. by rdsmith@chromium.org
https://chromium.googlesource.com/chromium/src/+/e93faff1da7b32ad86b9402ae20289921d622d24

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

(-rdsmith@ who moved on to a different project)

re93faff1da7b32ad86b9402ae20289921d622d24 only changes the Extensions code. Perf impact should be minimal. I don't think smoothness.tough_animation_cases benchmark exercises the Extensions code paths.

cad7fcc1c6659e192ac78d5c4f7dd18e21d4dfae in c#1127 too. It only works when ServiceWorkerServicification flag is on.

Most of these recovered, and can't find much more in the bisects to act on.