Merge "Add system feature for car splitscreen multitasking" into udc-dev am: b0e65046

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



Change-Id: I4dabcb951f0d494373af381492257e48efd18b5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>