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VideoSinks receive the new kind of VideoFrames and will replace VideoRenderers. Converting from old texture frames to VideoFrames will involve conversion to I420 so it is not recommended to use VideoSinks before all sources produce VideoFrames. BUG=webrtc:7749, webrtc:7760 Review-Url: https://codereview.webrtc.org/3002553002 Cr-Commit-Position: refs/heads/master@{#19335}