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

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

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



Change-Id: Id96776f168926e2949a026f329984a5519e20ac1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>