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We suspect that nobody uses this because it's completely undocumented,
but since it's exposed to developer we should gather metrics for a
little while to confirm.

Change-Id: I57b7b8dcd7e861842bdf81b8b62787f44e62ffbf
Reviewed-on: https://chromium-review.googlesource.com/1209642Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590428}