Merge "Determine whether to support activities in multi window (5/n)" into...

Merge "Determine whether to support activities in multi window (5/n)" into sc-dev am: 806b5b8e am: 6b5c45b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14390424

Change-Id: I3700c4c4389402570fb610912a0f42852c86660e