PSA: longtasks & hidden windows

Hola webperfies
I'm planning to introduce a change to the implementation of longtask
reporting in chrome, that would fix a few longtask-related issues, but
would introduce a new change in behavior: long tasks would only be reported
for visible windows.

Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1441419
CL (behind a flag):
https://chromium-review.googlesource.com/c/chromium/src/+/4495305

Before moving forward with this, I'd like to surface this to the group and
see if anyone is relying on longtasks being reported to hidden windows
(e.g. minimized, background tab).

Thoughts? Objections? 👍s?