Add TextTrackType export and textTracks prop

import PropTypes from 'prop-types';

import {StyleSheet, requireNativeComponent, NativeModules, View, ViewPropTypes, Image} from 'react-native';

import resolveAssetSource from 'react-native/Libraries/Image/resolveAssetSource';

import TextTrackType from './TextTrackType';

import VideoResizeMode from './VideoResizeMode.js';

const styles = StyleSheet.create({

  },

});

export { TextTrackType };

export default class Video extends Component {

  constructor(props) {

      PropTypes.number

    ])

  }),

  textTracks: PropTypes.arrayOf(

    PropTypes.shape({

      title: PropTypes.string,

      uri: PropTypes.string.isRequired,

      type: PropTypes.oneOf([

        TextTrackType.SRT,

        TextTrackType.TTML,

        TextTrackType.VTT,

      ]),

      language: PropTypes.string.isRequired

    })

  ),

  paused: PropTypes.bool,

  muted: PropTypes.bool,

  volume: PropTypes.number,