Re: [webrtc-stats] add rtt to rtcdatachannelsstats

@shacharz in addition to the clarification of the metric, it would be nice to know if this RTT is calculated per packet/ack. Depending on the freq of acks/packets, the RTT will be updated more often than getStats is called, we would need additional metrics to currentRoundTripTime, for example:

```
totalRoundTripTime
acksReceived
```

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Received on Monday, 5 November 2018 21:29:05 UTC