Reparent PiP overlay under task as soon as possible am: e338982c97

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23731681

Change-Id: Ib323bda54ece0a8689ae7f8e9020b27df1ce0cd7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>