[css-timing-1-tests] Add tests to css-timing-1. (#5345)

MozReview-Commit-ID: HszNpNTCM1N

Upstreamed from https://bugzilla.mozilla.org/show_bug.cgi?id=1248340 [ci skip]

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5345

Received on Tuesday, 4 April 2017 15:48:13 UTC