Re: [webrtc-pc] getSynchronizationSources (and getContriburingSources) should work for video too

what getContributingSources was designed for is this (jitsi, probably from around 2011):
![csrc](https://user-images.githubusercontent.com/289731/45491114-2bdaaa80-b769-11e8-8c49-48b60e0437ca.jpg)
(from wikipedia via @emcho)
-- showing the audio levels for participants, even when audio is mixed and the mixer uses the csrc audio level. getSynchronizationSources does the same but is a better alternative to using webaudio or even getStats to get this. Overloading this with the new semantics that you want for video does not seem like a good idea.

(and I did not want the "timestamp last packet received" on the receiver, not the track)

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