public @Nullable CloseableReference<CloseableImage> cloneOrNull(
      @Nullable CloseableReference<CloseableImage> closeableImage) {
    return CloseableReference.cloneOrNull(closeableImage);
  }
Multiplex producer that uses the bitmap memory cache key to combine requests.
imagepipeline/src/main/java/com/facebook/imagepipeline/producers/BitmapMemoryCacheKeyMultiplexProducer.java