static createArrow(id, text) {
    const arrow = DOM.createNode('a', id, text);
    arrow.href = '#';
    arrow.title = 'Arrow Keys';

    return arrow;
  }
Creates an arrow to navigate.
@param {!String} id Desired ID for the arrow.
@param {!String} text Desired text for the arrow.
@return {Element} The arrow element.