Merge "Remove activity from unknown app if starting window is relayouted."...

Merge "Remove activity from unknown app if starting window is relayouted." into sc-dev am: cfde5c2b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15102787

Change-Id: I055fb2a636d7dbc3076b3ebd491d980e22452a12