Merge "Handle split to pip if open another fullscreen app case" into udc-dev am: dbc02d3fb6

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

Change-Id: I50c725d2a5803b573fe7abdb1cb2d490475668b2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>