Merge "Allow entering split screen on an app currently open in desktop mode."...

Merge "Allow entering split screen on an app currently open in desktop mode." into udc-qpr-dev am: 98c1d220

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24249099



Change-Id: Ic9cd01c907e188ed57ee82fd8f124e0996a0580f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>