Enable rich animation when it's unit test

We should always enable rich animation. Otherwise, unit tests
could be flaky.

Bug: 923849
Change-Id: I87371df838ffa2f2f8c0a9baf5b439450c81e994
Reviewed-on: https://chromium-review.googlesource.com/c/1426239
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625039}
1 file changed