@Override
            public List<T> getPreloadItems(int position) {
                return getItems(position, position + 1);
            }
Constructor for {@link ListPreloader} that requires users to subclass and override
the {@link #getItems(int, int)} and {@link #getRequestBuilder(Object)} methods.

@deprecated Use {@link #ListPreloader(PreloadModelProvider,
PreloadSizeProvider, int)} instead. This constructor will be removed in Glide
4.0.
@param maxPreload Maximum number of items to preload.
core/src/main/java/com/bumptech/glide/ListPreloader.java