polygerrit-ui/app/gr-diff/gr-diff-root.html

<script>
  // Needed for JSCompiler to understand it's global.
  // eslint-disable-next-line no-unused-vars, prefer-const
  let Gerrit = window.Gerrit || {};
</script>
<link rel="import" href="../elements/diff/gr-diff/gr-diff.html">