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

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



Change-Id: I5c67998768611c297ff0681797585ca069c956a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>