Conservatively trim data usage stats.

Instead of trusting NTP time alone, use the most-conservative of
system clock and NTP.

Bug: 5584564
Change-Id: I5dd87fc009959b1cf0a7d660e385a0b1a8be238b
1 file changed
tree: a57fde364c9e47432f2f480d569dceb0abc1c196
  1. core/
  2. services/