Merge "Merge "Add a callback to listen to uid foreground-ness change." into...

Merge "Merge "Add a callback to listen to uid foreground-ness change." into udc-dev am: b0302b10 am: 31fb0397" into udc-d1-dev-plus-aosp am: a974c029

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22499498



Change-Id: I3b5dd025b9b6467db587860883f6cfe06ee0590f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>