jitterBufferDelay and jitterBufferEmittedCount are defined in RTCMediaStreamStats for both audio and video. But for video, they were not populated in RTCInboundRtpStreamStats. Bug: webrtc:12910 Change-Id: I135d473f055ecfb2c39b078ccf18c1bb9bc4f210 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224280 Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34398}