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Since we are the only ones using protobuf JS
this adds a test proto file to the public
repo so our build doesn't get broken by
accident.

BUG=1087037

Change-Id: I349c80e98d1b9e9d9cd414a418852eb2f899a7f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254523
Auto-Submit: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780445}