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 am: 79a7dc57

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

Change-Id: Icb4f46cd90a1c66221d2acfc6cd642277f6c7f7d