Chromium change:
https://github.com/chromium/chromium/commit/83240f0bfaff0e0056e0c806e49530bfc06b80f5
Feed: Refactor reliability logging code and add some tests
* Move common logging methods out of FeedSurfaceCoordinator and FeedSurfaceMediator and into a new class, FeedReliabilityLogger
* Add missing unit tests
* Remove some unnecessary mentions of feed reliability logging from Start Surface code
* Use SystemClock.elapsedRealtimeNanos() which can measure time correctly if the device sleeps (theoretically better but probably not very important in practice)
FeedReliabilityLogger is also meant to be a home for future reliability logging logic beyond the feed launch, like "user taps card and sees content".
Bug: 1195940
samartnik
7c50bb3311