@Nullable
  @Override
  public DrawableFactory getAnimatedDrawableFactory(@Nullable Context context) {
    if (mAnimatedDrawableFactory == null) {
      mAnimatedDrawableFactory = createDrawableFactory();
    }
    return mAnimatedDrawableFactory;
  }
{@link AnimatedFactory} for animations v2 that creates {@link AnimatedDrawable2} drawables.
animated-base/src/main/java/com/facebook/fresco/animation/factory/AnimatedFactoryV2Impl.java