Merge "Reparent PiP overlay under task as soon as possible" into udc-dev am: ccafc6b3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23732847



Change-Id: I818ec182ab48a59e51ad6714000d7b377376e4e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>