code: public static CompressedTextureCallback wrapCallback(
              ResourceCache<GVRImage> cache, CompressedTextureCallback callback) {
          return new CompressedTextureCallbackWrapper(cache, callback);
      }
docs: Wrap the callback, to cache the
  {@link CompressedTextureCallback#loaded(GVRHybridObject, GVRAndroidResource)
  loaded()} resource