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There will need to be a follow up CL that adds an implementation for Chrome to provide an actual key.

Bug: 906202
Change-Id: Ib471b1124e19b11755b410f384a447f929a1b547
Reviewed-on: https://chromium-review.googlesource.com/c/1351709
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615534}