code: func GitilesCommitURL(c *pb.GitilesCommit) string {
  	return fmt.Sprintf("%s/+/%s", GitilesRepoURL(c), c.Id)
  }
docs: // GitilesCommitURL returns the URL for the gitiles commit.
  // e.g. "https://chromium.googlesource.com/chromium/src/+/b7a757f457487cd5cfe2dae83f65c5bc10e288b7"