Merge "Explicit Nullbility in Launcher (Part 3)" into tm-qpr-dev am: 3426372f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19890491



Change-Id: I136275b2dc04ec496ba6e32616eaf92732cc0198
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>