Merge "Add a flag to limit notif-seen signal changes to T targeting apps."...

Merge "Add a flag to limit notif-seen signal changes to T targeting apps." into tm-dev am: 92762b94 am: 7fa4cd19

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18469138



Change-Id: I78e21a777da03b06287cfce246669a75ba8ea1b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>