Merge "Expose getTx/RxBytes in TrafficStats" am: 6ef6648cd9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440245

Change-Id: I69eb11657318438dbe794da849182a08e1847f94
tree: 723bad4c257afa0fc39295c0462b4840f5018fe4
  1. core/
  2. services/
  3. wifi/