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When starting animation to target drag state when sliding app window
into home screen, if target home visibility is shown,
HomeLauncherGestureHandler will hide and minimize the dragged window,
which might cause focus to move to app list, and app list visibility
to get updated before home gesture launcher animation is finished.
If the app list visibility is changed at this point, the observers
(notably shelf layout manager) will still think that the home state is
changing, and will update its state accordingly. The state would not
get updated when the animation finishes, given that another
AppListVisibilityChanged notification would be skipped after the
animation state is updated.

To avoid this, delay the AppListVisibiltiyChanged notification until
the home launcher finishes the transition.

BUG=1021253

Change-Id: I65d06cb88fd7042ca8df0a1a84d24109ccaa0e80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894750Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714722}