Merge "Transitions - Listen for bouncer show & hide" into tm-qpr-dev am: be5367c9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20639790



Change-Id: If23b9be9b8a4c0f256272e12eb391d307c2077bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>