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: 10b626b2 am: b5e90dd1 am: 5ea920a3

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



Change-Id: I43de3bae2236b1dd93273643044fb2511cf5357d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>