Merge "Add SystemMessages protos to Connectivity" am: 470e9e0e19

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

Change-Id: I8648b09a97485dcecac2e5075d605e79a730ec3f
tree: 3ad148d388280031658fedb90ecff93af9bf9945
  1. framework/
  2. service/
  3. OWNERS