Merge "Add NOTIFICATION_GROUP_DISMISSAL_ANIMATION flag" into tm-qpr-dev am: 848de045f4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20413985

Change-Id: I62ef7f6188a7a3520c3f0660534d15bd8f4145ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>