2af0b66aba
This API is similar to one provided by NetworkStatsFactory with the difference that NSS also migrates traffic from VPN UID to other apps. Since traffic can only be migrated over NetworkStats delta, NSS therefore maintains NetworkStats snapshot across all UIDs/ifaces/tags. This snapshot gets updated whenever NSS records a new snapshot (based on various hooks such as VPN updating its underlying networks, network getting lost, etc.), or getDetailedUidStats API is invoked by one of its callers. Bug: 113122541 Bug: 120145746 Test: atest FrameworksNetTests Test: manually verified that battery stats are migrating traffic off of TUN (after patching above CL where we point BatteryStats to use this API). Change-Id: Ib0f0c2d4d41ee1d7a027ea9da457baaf198d649e