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

Merge "Add system feature for car splitscreen multitasking" into udc-dev am: b0e65046 am: f4248496 am: 15bb6068 am: 007f428f

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



Change-Id: I917941452085d76e7127d36703891857040983b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>