Merge "Add unit test for NetworkStatsSubscriptionsMonitor" into rvc-dev am: 4ca7d588b4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11788484

Change-Id: Iac633487b359d751206e06b2352a2a9cb475811e
tree: bd9da54c78b0e7f0c8c49109d36ca50f12cdca4f
  1. core/
  2. services/
  3. tests/