Resync web-platform-tests/user-timing from upstream.
Created attachment 404013 [details] Patch
Comment on attachment 404013 [details] Patch rs=me
Created attachment 404025 [details] Patch
Committed r264255: <https://trac.webkit.org/changeset/264255> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404025 [details].
<rdar://problem/65379890>