Merge "Adding support for determining split layout for launcher." into sc-dev am: c52c0782a7 am: 5fd433fb21

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14286682

Change-Id: I6a42682f6c0bac8c29df3a9abe15c68eba550f40