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: 096b8f91 am: 8c50c31b

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



Change-Id: I3902a272adf426d5884453c57933275011ba3765
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>