henrik.lundin c9badd52c8 Add comment to metrics.h
BUG=None
NOTRY=True
TBR=rkaplow@chromium.org,asapersson@webrtc.org

Review-Url: https://codereview.webrtc.org/2557693002
Cr-Commit-Position: refs/heads/master@{#15439}
2016-12-06 11:59:08 +00:00
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