Merge "Separate code paths to launch split from existing pair vs new pair" into udc-dev am: 258019fe8e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23320818

Change-Id: I03633c672b86085447886071f885b4d788f5ab9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>