rn the polyfill on if requested by the query args.
      if (WGLUUrl.getBool('polyfill', false)) {
        InitializeWebVRPolyfill();
      } else {
        // Shim for migration from older version of WebVR. Shouldn't be necessary for very long.
        InitializeSpecShim();
      }
    </script>
    <!-- End sample polyfill enabling logic -->

    <script src="js/third-party/gl-matrix-min.js"></script>

    <script src="js/third-party/wglu/wglu-program.js"></script>
    <script src="js/third-party/wglu/wgl