Merge "Makes lock screen long-press popup background fixed." into udc-dev am: 7738e34d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22767422



Change-Id: I698e0971f8bc76c4d3c4fd18c17a8c8d180e457f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>