Merge "Add child sensitivity change listener to NotificationStackScrollLayout" into udc-dev am: 37018415 am: 3177f39a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22223569



Change-Id: I1b4d55e7aa193b55874a36f44c1f75bb4146041c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>