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: 179cad08" into udc-d1-dev-plus-aosp am: 1a0f61d6

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



Change-Id: I8b9190454cb13a9d31cfcb33a6252434cffa133b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>