Merge "Add system ui background handlers dispatch and delivery logging...

Merge "Add system ui background handlers dispatch and delivery logging thresholds" into udc-dev am: 02557142 am: be343037

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23201203



Change-Id: I57b099bdd7234802fc5cf18a1f09f145c436e715
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>