Merge "Determine whether to support activities in multi window (4/n)" into...

Merge "Determine whether to support activities in multi window (4/n)" into sc-dev am: 314e0d14 am: 5494f299

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14404373

Change-Id: Ie4e6692f746667a5df29bcd5d71d3d52a9b88254