nisse db25d2e8c5 Make VideoTrack and VideoTrackRenderers implement rtc::VideoSourceInterface.
This patch tries to only change the interface to VideoTrack, with
minimal changes to the implementation. Some points worth noting:

VideoTrackRenderers should ultimately be deleted, but it is kept for
now since we need an object implementing webrtc::VideoRenderer, and
that shouldn't be VideoTrack.

BUG=webrtc:5426
TBR=glaznev@webrtc.org  // please look at  examples

Review URL: https://codereview.webrtc.org/1684423002

Cr-Commit-Position: refs/heads/master@{#11775}
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