public Bitmap getImageSync(ReadableMap map) {
        if (!map.hasKey(URI_KEY)) {
            throw new IllegalArgumentException("Unable to find \"uri\" key in given source map.");
        }
        return getImageSync(Helper.parseUri(map.getString(URI_KEY), mContext));
    }
This method fetches an image synchronously.

@param map a ReadableMap with a "uri" key, ideally the same one we get from the JS layer
@return the bitmap containing the image data
android/viro_bridge/src/main/java/com/viromedia/bridge/utility/ImageDownloader.java