@LottieDrawable.RepeatMode
  public int getRepeatMode() {
    return lottieDrawable.getRepeatMode();
  }
Defines what this animation should do when it reaches the end.

@return either one of {@link LottieDrawable#REVERSE} or {@link LottieDrawable#RESTART}
lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java