code: function getExtensionWithKnownPrefixes(gl, name) {
      for (var ii = 0; ii < browserPrefixes.length; ++ii) {
        var prefixedName = browserPrefixes[ii] + name;
        var ext = gl.getExtension(prefixedName);
        if (ext) {
          return ext;
        }
      }
      return undefined;
    }
docs: Given an extension name like WEBGL_compressed_texture_s3tc
  returns the supported version extension, like
  WEBKIT_WEBGL_compressed_teture_s3tc
  @param {string} name Name of extension to look for
  @return {WebGLExtension} The extension or undefined if not
  found.
  @memberOf module:webgl-utils