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ui::RecreateLayers() works only with LayerOwners. This means that
Shadow which creates its own layers won't be recreated and the old
layers won't be returned in the old layer tree returned by
ui::RecreateLayers().

This fixes the shadow disappearing for the window-move-to-desk
animation.

BUG=977434
TEST=Manually, shadow should show while animating, no change in behavior.

Change-Id: Iabd12036821a35b56804b5ac774714598fb39e95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711046
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681158}