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 am: 254445b0

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



Change-Id: I6d0e4e7a97bcb67c06acb9789fd45114f675752c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>