@Nullable
  @Override
  public CloseableReference<Bitmap> getBitmapToReuseForFrame(
      int frameNumber, int width, int height) {
    // Not supported
    return null;
  }
This naive implementation does not share Fresco's bitmap cache but has its own LRU. This should
just be used for testing. The cache does not support fallback frames or frame re-using.
samples/animation2/src/main/java/com/facebook/samples/animation2/bitmap/NaiveCacheAllFramesCachingBackend.java