Merge "Allow the user to collapse the notification panel on quick settings" into rvc-dev am: 8e47723834 am: 277c7783e5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12039363

Change-Id: I4e34fceeb7d16ab98611a08da975acd68f32f578