Merge "Determine whether to support activities in multi window (9/n)" into...

Merge "Determine whether to support activities in multi window (9/n)" into sc-dev am: b9034aba am: 3a21aa0e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14606008

Change-Id: Idb8717ad2f24c83326b61d6e2af3a579e683f97e