Merge "Individually track vis duration of unseen notifs" into udc-qpr-dev am: 84d1b09a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23481457



Change-Id: I0d2f93b820d10fc58910621cbdc12378bcd4ef35
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>