setupMSDEventListeners_() {
    const onPlaybackPlay = () => this.onPlaybackPlay_();
    this.eventManager_.listenOnce(
        this.video_, 'play', onPlaybackPlay);

    const onPlaybackPlaying = () => this.onPlaybackPlaying_();
    this.eventManager_.listenOnce(
        this.video_, 'playing', onPlaybackPlaying);
  }
Setup event listeners for msd calculation
@private