Merge "Launcher3: Added shared lib APIs for Launcher to use split-screen APIs." into sc-dev am: ed8473357d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13472974

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0a17378471a91dd60fb9b3f3382e56cd1681756c