Upstream animation-play-after-finish-restarts.html from Blink

[suzyh]

Import https://chromium.googlesource.com/chromium/src/+/f9c8bd86683623176fb87b8cdc84bac594c46176/third_party/WebKit/LayoutTests/web-animations-api/animation-play-after-finish-restarts.html

[wpt-pr-bot]

Reviewers for this pull request are: @birtles.

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/6732

This is an external review system which you may optionally use for the code review of your pull request.

In order to help critic track your changes, please do not make in-place history rewrites (e.g. via git rebase -i or git commit --amend) when updating this pull request.

[w3c-bots]

These tests are now available on w3c-test.org

[w3c-bots]

View the complete job log.

Firefox (nightly channel)

Testing web-platform-tests at revision 2aca5e29a9202eed618946e1d3569bd1b0a7ae50
Using browser at version BuildID 20170314110401; SourceStamp 6d38ad302429c98115c354d643e81987ecec5d3c
Starting 10 test iterations
All results were stable

All results

1 test ran

/web-animations/timing-model/animations/playing-an-animation.html

Subtest	Results	Messages
	OK
Playing a running animation leaves the current time unchanged	PASS
Playing a finished animation seeks back to the start	PASS
Playing a finished and reversed animation seeks to end	PASS

[w3c-bots]

View the complete job log.

Chrome (unstable channel)

Testing web-platform-tests at revision 2aca5e29a9202eed618946e1d3569bd1b0a7ae50
Using browser at version 58.0.3029.19 dev
Starting 10 test iterations
All results were stable

All results

1 test ran

/web-animations/timing-model/animations/playing-an-animation.html

Subtest	Results	Messages
	OK
Playing a running animation leaves the current time unchanged	PASS
Playing a finished animation seeks back to the start	PASS
Playing a finished and reversed animation seeks to end	PASS