This PR fixes some failing tests that started failing after the check on animations being played on the JavaFX thread was enforced, by simply wrapping the `play` call with `Platform.runLater`
------------- Commit messages: - Run timelines on JavaFX thread Changes: https://git.openjdk.org/jfx/pull/1211/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1211&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8314266 Stats: 7 lines in 3 files changed: 1 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jfx/pull/1211.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1211/head:pull/1211 PR: https://git.openjdk.org/jfx/pull/1211
