Merge "[flexiglass] Pattern bouncer UX polish." into udc-dev am: e2ccf110 am: c1972a11

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



Change-Id: I2058a3a7b6549e9e9dfefd53c20df56d3a5fab62
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>