Merge "Add ENABLE_PIP_APP_ICON_OVERLAY experiment" into tm-qpr-dev am: 13ecff06 am: f77f2bd4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21108424



Change-Id: I1c61cc5fb2425dea2c413922ef204b5b05f09917
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>