GitLab

Also rename "animation state" to "transition state" since this also
represents drag state.

Bug: 1012760
Change-Id: Ic890be82ddd4cb713759c07985cc7e4b1210b029
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910761Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714384}