Merge "Remove Activity if it enters PiP without window" into rvc-dev am: 81224e6f am: d6a9b807 am: 6255caf9 am: d1283341 am: b03c904b am: b7e5c161 am: 8e1c0af2 am: 862a5466 am: 49433e9d

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



Change-Id: I93e2dd56da9e38715a1947704b5ab3d63a7d3813
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>