Add a timestamp for last data sent in Connection.
Move calling of rtc::TimeMillis() to Connection and remove it from RateTracker::AddSamples.
This timestamp will be used to further improve fail over logic.
BUG=None
Change-Id: I4cbc7693a0e081277590b9cb13264dc2a998202e
No-Try: True
Change-Id: I4cbc7693a0e081277590b9cb13264dc2a998202e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/197421
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32831}
3c5d5824a3