Merge "Add SystemMessages protos to Connectivity" am: cf638d345b am: 02e5fcf301 am: 3b780f79d3

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1626204

Change-Id: Ia8a06a0d6f5dcdbdc672149ff206aada83478f23
tree: 8d3628fa92ed36750716c6487fa2613a64e8629a
  1. framework/
  2. service/
  3. services/
  4. tests/
  5. OWNERS