Merge "Remove Activity if it enters PiP without window" into rvc-dev am: 81224e6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21564420



Change-Id: I707ee5856d28f823559d3e8d3e43e5803685ca6a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>