@Override
    public boolean supportsImageType(CloseableImage image) {
      return image instanceof CloseableKeyframesImage;
    }
Although keyframe files do not have an explicit header, we try to match by looking for a JSON
file start and known mandatory keys.
samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/imageformat/keyframes/KeyframesDecoderExample.java