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Passing transport_frame_id() to VideoSink will allow to identify incoming video frames, which will make it possible to correlate video frames on the sender and on the receiver. BUG=chromium:621691 R=mflodman@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/2088953002 . Cr-Commit-Position: refs/heads/master@{#13596}