[webrtc-stats] Pull Request: Add droppedSamplesEvents and synthesizedSamplesEvents

henbos has just submitted a new pull request for https://github.com/w3c/webrtc-stats:

== Add droppedSamplesEvents and synthesizedSamplesEvents ==
Fixes #677, #679.

Because sample drops and sample synthesization tend to happen in bursts it is useful to not only know the duration but also the number of "events" happened.

The definition for these are very similar to [concealmentEvents](https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-concealmentevents).



See https://github.com/w3c/webrtc-stats/pull/688


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