Merge "Add a flicker test for auto-enter pip from split screen." into udc-dev...

Merge "Add a flicker test for auto-enter pip from split screen." into udc-dev am: 01b189fb am: df74ffe5 am: cd38d6d2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23503133



Change-Id: I3d6af61073d381c20e7215728b847a40f3959ff3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>