Merge "Turn on Wallpaper Fullscreen preview" into tm-qpr-dev am: 270bd3c80b am: 065613ee91

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21164327

Change-Id: I117d4f75c978fa43a6e905ea73902924dc8e6e6d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>