Merge "NotificationChildrenContainer apply the roundness on NotificationHeaderViewWrapper too" into tm-qpr-dev am: ac576e7ee4 am: d270587191

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20911787

Change-Id: I01efc4ae51488a63e11f6d02c1df742189008162
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>