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: bbcb4cd4

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



Change-Id: I82c6f415ad22270f8a921a73ad6fbc5e88841483
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>