Merge "[flexiglass] Pattern bouncer UX polish." into udc-dev am: e2ccf110 am: 02c8ed2f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23246162



Change-Id: Idfb66d8c1f41eeb5d3feb931235e6c0745ed717c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>