Add GomaApproach for ChromeOS builders.

To isolate ChromeOS builders, let me set yet another approach for
ChromeOS builders.

BUG=b:162292728
TEST=this is proto definition update, and will be tested with CQ.

Change-Id: I505a4e170bfb90e6ad7218e0c35cd1acee9eef78
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2540046
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Auto-Submit: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
2 files changed