fillHolesAsync(doc, callback) {
    var serializer = this;
    this.fillFontHoles(doc, function() {
      serializer.fillSrcHoles(callback);
    });
  }
/**
   * Asynchronously fill in any holes in |this.html|.
   *
   * @param {Document} doc The Document being serialized.
   * @param {Function} callback The callback function, which will be called when
   *     all asynchronous processing is finished.
   */
Asynchronously fill in any holes in |this.html|.
@param {Document} doc The Document being serialized.
@param {Function} callback The callback function, which will be called when
all asynchronous processing is finished.
Asynchronously fill in any holes in |this . html| . @param { Document } doc The Document being serialized . @param { Function } callback The callback function which will be called when all asynchronous processing is finished .
fillHolesAsync(doc, callback) {
    var serializer = this;
    this.fillFontHoles(doc, function() {
      serializer.fillSrcHoles(callback);
    });
  }
fillHolesAsync ( doc , callback ) { var serializer = this ; this . fillFontHoles ( doc , function ( ) { serializer . fillSrcHoles ( callback ) ; } ) ; }
Asynchronously fill in any holes in |this.html|.
Asynchronously fill in any holes in |this . html| .