Merge "Determine whether to support activities in multi window (3/n)" into...

Merge "Determine whether to support activities in multi window (3/n)" into sc-dev am: e5fe75d2 am: 6c0fc6c6 am: 85b7d405

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14355985

Change-Id: Ia9db15db05e4c554d059cd1aeb09c360faf8b19b