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There are still issues in the app list visibility observer patterns,
but this is a step towards smoother animations by letting the shelf
config be aware of the new "desired" state sooner.

Bug: 1006013
Change-Id: Id90e2355f8120fcb51319189288a1956506dc8f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832634
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702096}