[FUI09] Expose NetworkStateSnapshot as system API

This is needed by NetworkStatsService and
NetworkPolicyManagerService to utilize the snapshots of
information of networks that grabbed from ConnectivityService.

Test: atest FrameworksNetTests NetworkPolicyManagerServiceTest
Bug: 174123988
Change-Id: I7e974ef7b23ba9ba6ee775eed9899b0c0e2eca55
4 files changed
tree: 0296a7a3734b45c5a6e26f32c0aeadf7f31b5064
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS