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This also adds RTCRTPStreamStats[2] which it derives from. Not all stats are supported in this CL, this must be addressed before closing the issue. RTCStatsReport also gets a timestamp and ToString. [1] https://w3c.github.io/webrtc-stats/#outboundrtpstats-dict* [2] https://w3c.github.io/webrtc-stats/#streamstats-dict* This was previously reverted https://codereview.webrtc.org/2465223002/ because RTCStatsReport::Create added a new parameter not used by Chromium unittests. Temporarily added a default value to the argument to be removed after rolling and updating Chromium. BUG=chromium:627816, chromium:657856, chromium:657854 TBR=deadbeef@webrtc.org Review-Url: https://codereview.webrtc.org/2470703002 Cr-Commit-Position: refs/heads/master@{#14866}