Merge "Add system feature for car splitscreen multitasking" into udc-dev am: b0e6504657 am: f424849635

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23335092

Change-Id: Icf73bf0cf05a61bb324582bbc8564f20fbb44826
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>