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Previously, it could be fired before the final layout of the animation.
Now it will be fired after the final layout is applied, so the child
views are all in their final states.

Bug: 995596
Change-Id: Idbc187e4d4b2bf28cf720845180a427a2d04778a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762060
Auto-Submit: Dana Fried <dfried@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688766}