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 am: 7e1d5683

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

Change-Id: Id9f0acd43199de5253d87d7850092d31ff32b69f