Merge "[Unfold animation] Move unfold animation background under wallpaper"...

Merge "[Unfold animation] Move unfold animation background under wallpaper" into udc-dev am: 11979783 am: 98efd348 am: a0ec131c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22814876



Change-Id: I0d1e7abe893050f54c96d12c16d555f04280b01b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>