Per 4d19c5b010 This cl introduce a VideoSourceInterface and let cricket::VideoCapturer implement it.
Further more, it adds a VideoBroadcaster than is used for delivering frames to multiple sinks.

BUG=webrtc:5426
R=nisse@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1655793003 .

Cr-Commit-Position: refs/heads/master@{#11567}
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