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This is part of an effort to characterize RTCPeerConnection usage.

UKM metric review document: https://docs.google.com/document/d/1Pq6Xxv8Mf10cgRFDCYPgIPD-US7uHyxQ31hdZT6uu4Y/edit

Bug: chromium:866792
Change-Id: I38e0d7ee406e6246d8d013d7f96ad50f51b96a78
Reviewed-on: https://chromium-review.googlesource.com/1150539
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580760}