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The metrics themselves are added in the separate CL in webrtc.

Bug: webrtc:8355
Change-Id: Ic7d98d7e1f5b30d62a79418b110e3e9c7123008f
Reviewed-on: https://chromium-review.googlesource.com/921221Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537276}