Add proto files for chrome_cleaner

R=csharp

Bug: 830892
Change-Id: Ie89fdddf5ebdfba3e0d5e8ca3205de170c338759
Reviewed-on: https://chromium-review.googlesource.com/1072457
Reviewed-by: proberge <proberge@chromium.org>
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564084}
12 files changed