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

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



Change-Id: I2b1627a53e6c14a2b3614b5b29841c5475882443
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>