c481d65c6b
This includes a new media query tests, and two changes that are relevant
to this regression:
* b5b511804c
* https://github.com/WebKit/WebKit/pull/44550
This makes sure this performance test measures what's intended to
measure.
Also updates mozilla.patch to account for
https://hg.mozilla.org/mozilla-central/rev/d40e89f84d6f59cdd9ba248feccb3f2bf6d48c74,
which landed without updating it, and updates README_MOZILLA to account
for WebKit's move to git.
Differential Revision: https://phabricator.services.mozilla.com/D246831