Re: [webrtc-pc] RTCRtpContributingSource.timestamp needs a clearer definition

> define these timestamps in reference to the context's global monotonic clock
> ... prefer to have something that gives "something like the wall clock"

@alvestrand It sounds like you want a timestamp that's comparable to

```js
performance.timing.navigationStart + performance.now()
```
Is that correct?

> you better not be comparing it to Date.now() even though it'll be really tempting!

As @bzbarsky points out, [a bit of a footgun](https://jsfiddle.net/jib1/zqpo4kcq/), but an improvement over *getStats*'s timestamp today, and more backwards compatible than say, changing its (zero-)origin from 1970 to page load.

I like it, if we can move both *getStats* and *getContributingSources/getSynchronizationSources* to it.


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