nisse 81354f5ef6 Added mute logic to VideoTrackRenderers.
If the track is disabled, replace incoming frames by black frames. Affects local rendering of disabled tracks.
Also intended to replace the similar logic in
WebRtcVideoChannel2::WebRtcVideoSendStream::InputFrame, once
VideoRtpSender is hooked up as a renderer for the track.

BUG=webrtc:5426

Review URL: https://codereview.webrtc.org/1575223003

Cr-Commit-Position: refs/heads/master@{#11297}
2016-01-19 08:23:31 +00:00
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