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According to spec: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamtrackstats-framesdecoded BUG=webrtc:6757, chromium:659137, chromium:627816 Review-Url: https://codereview.webrtc.org/2642713004 Cr-Commit-Position: refs/heads/master@{#16192}