Backport some helpers in ConnectivityServiceTest. am: 853504c524

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13425318

Change-Id: I7ffa0faf61ccc7238b65e0f9ed863939e5089f06
tree: 2ed88146905711a004b29d465a47872701105a11
  1. core/
  2. services/
  3. tests/