Merge "Determine whether to support activities in multi window (2/n)" into sc-dev am: 34eedf49 am: 55ddb6ce am: 18295b0f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14343779

Change-Id: I69db107c1944e636e14f761bf54467bbbe8a468e