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To make it possible to write a test client without having to write too
many empty implementations.

Change-Id: I45139957848a4d48e02740cc349605ab4b75e3a0
Reviewed-on: https://chromium-review.googlesource.com/1013997
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553781}