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: 4f71a727 am: ec302c2d am: 3ba472af

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



Change-Id: I4046e453712819fd4e7f88c8c58acfe25a4d6e00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>