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RTCStatsCollector supports "payloadType", "codec" and "clockRate". "channels", "parameters" and "implementation" need to be supported before closing crbug.com/659117. [1] https://w3c.github.io/webrtc-stats/#codec-dict* BUG=chromium:659117, chromium:627816, chromium:657854 NOTRY=True Review-Url: https://codereview.webrtc.org/2509803004 Cr-Commit-Position: refs/heads/master@{#15207}