code: function findGraphics(item, queue)
  {
      if (item instanceof Graphics)
      {
          queue.push(item);
  
          return true;
      }
  
      return false;
  }
docs: Built-in hook to find graphics.
  
  @private
  @param {PIXI.DisplayObject} item - Display object to check
  @param {Array<*>} queue - Collection of items to upload
  @return {boolean} if a PIXI.Graphics object was found.