Merge "Fix a typo in ImageDecoder documentation"

     *  {@link OnHeaderDecodedListener OnHeaderDecodedListener} and once with an

     *  implementation of {@link OnHeaderDecodedListener#onHeaderDecoded onHeaderDecoded}

     *  that calls {@link #setTargetSize} with smaller dimensions. One {@code Source}

     *  even used simultaneously in multiple threads.</p>

     *  can even be used simultaneously in multiple threads.</p>

     */

    public static abstract class Source {

        private Source() {}