Merge "Individually track vis duration of unseen notifs" into udc-qpr-dev am: f58e1e47

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23904070



Change-Id: I7c3feaf7f1cf0c6d0bbca4c218d6770d8afce84e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>