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Assistant UI and search results page in the app list view may contain
hosted native views (e.g. for answer cards, or assistant card UI
elements). These would not animate with the app list page layers,
causing glitches when app list view was animating after drag to
fullscreen or half position.

This CL updates the app list view contents animations for app list view
state change to animate windows hosted within the app list (i.e. app
list window children that have a host view property).

Along the way, this makes sure that page shadoes are animated together
with the page layers.

BUG=b:147825124

Change-Id: Ic1974b8a6767bbc25fdf96d5d6a67c41eb906fff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136845
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757119}