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Spec: https://henbos.github.io/webrtc-provisional-stats/#dom-rtcinboundrtpstreamstats-contenttype This already exists as a goog-stat. This CL only plumbs the value to the new stats collector. Note: There is currently no distinction between the extension being missing and it being present but the value being "unspecified". Until https://crbug.com/webrtc/10529 is fixed, this metric is only exposed if SCREENSHARE was present. Bug: webrtc:10452 Change-Id: Ic8723f4d0efb43ab72a560e954676facd3b90659 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131946 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27520}