Merge "Allow to transfer starting window from dying activity" into sc-v2-dev...

Merge "Allow to transfer starting window from dying activity" into sc-v2-dev am: a0eaed87 am: 23d9dcdd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15430795

Change-Id: I9eaae7207f0e4122963cc4dbc54cb766a3dbd0fa