Merge "Completely remove pinned task when starting a new PiP" into tm-dev am:...

Merge "Completely remove pinned task when starting a new PiP" into tm-dev am: bfbf74ae am: 420f7e1d am: 0d6a4a13 am: 209188fc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18175783



Change-Id: If6291e5152448e3a97d27effb93e8973e7a38d44
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>