Fill in more implementation of animation callbacks.

Bug: 1236069
Change-Id: Ic76a7b974c510abbd8ed552a392a1736af87925d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3071813


Commit-Queue: Allen Bauer (OOO - 8/5 - 8/8) <kylixrd@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#908702}