Taylor Brandstetter 80d661cb7a Use monotonic clock for legacy stats caching.
Fixes a bug where, if the wall clock goes backwards (from changing time
zone, daylight savings, manual change by user, etc.), the stats
collector stops updating stats.

Bug: webrtc:12439
Change-Id: Ie45f484110d43444aea6d6b1a218b05d0f8b6a0c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/206622
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Taylor <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33240}
2021-02-11 21:45:30 +00:00
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