Merge "Add flag for async bouncer." into tm-qpr-dev am: ccc5a355

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21890384



Change-Id: Iebb9e37488bdaaaa91a7ef9997e81b61c5abc5e3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>