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Add stats platform API for client and server side.

R=rch@chromium.org

Change-Id: Ic26e26b1e77916f1f76da3c7cb9b1b1cc43e3e8f
Reviewed-on: https://chromium-review.googlesource.com/c/1344193Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Dan Zhang <danzh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611857}