[CSS Transitions] Add test for reparenting

As per https://github.com/w3c/csswg-drafts/issues/3309, any CSS
Transition on a reparented element should be cancelled, as it leaves and
then re-enters the Document. This already works on Chrome, Firefox, and
Safari but fails on Edge.

Bug: 902328
Change-Id: I097675a8146c8047417dd48193d0747216418cfb
Reviewed-on: https://chromium-review.googlesource.com/c/1374742
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616830}
1 file changed