Fade out navbar on lockscreen -> homescreen transition am: 975fa692 am: 6353f6b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22422409



Change-Id: I83f8ad85e4fbc990afdfc4b88191a10fa989dae1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>