cc555c5019
Also updates MockDataChannel to also mock id, messages_sent, bytes_sent, messages_received and bytes_received. [1] https://w3c.github.io/webrtc-stats/#dcstats-dict* BUG=chromium:654927, chromium:627816 Review-Url: https://codereview.webrtc.org/2420473002 Cr-Commit-Position: refs/heads/master@{#14670}