Merge "Handle split to pip if open another fullscreen app case" into udc-dev...

Merge "Handle split to pip if open another fullscreen app case" into udc-dev am: dbc02d3f am: 58183d66 am: 563fd65f am: e571c3f2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23467957



Change-Id: If5b8d3c40530875754bcd7ec0716e6dd60b85952
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>