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This will be used to allow a kill-switch for the feature post-launch as
well as help debugging.

Bug: 903263
Change-Id: Icaf0b9ea4f28f9abddfa67f88fc6759aca812ec3
Reviewed-on: https://chromium-review.googlesource.com/c/1349476Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611404}