Re: [web-animations-tests] Move some utility functions into test_common.js. (#4481)

Notifying @birtles. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4481#issuecomment-270148591

Received on Tuesday, 3 January 2017 16:02:30 UTC