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

Merge "[Unfold animation] Move unfold animation background under wallpaper" into udc-dev am: 11979783 am: a3687621

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



Change-Id: Id107142405fd8eb3ef0b012911341947b1cbb320
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>