In internalGetSummaryForNetwork, the history object will not
include the latest bucket because of the logic in
NetworkStatsHistory#recordHistory would only include buckets
that atomically occur in the inclusive time range.
This makes querySummaryForDevice callers who are also sensitive
to the latest bucket fails.
This CL revert the behavior back to S, in T this is temporarily
changed after aosp/1937268.
Also, for test purpose, this CL change System.currentTimeMillis to
use mClock when querying.
Ignore-AOSP-First: Urgent fix
Test: NetworkStatsServiceTest#testGetLatestSummary
Bug: 233733267
Change-Id: I55e2a5d953622b68da36a9b8d3e57c88d57543b0
e971f15288