protected void onPostExecute(Texture result) {
            if (mListener == null || !mListener.isValid()) {
                return;
            }

            mListener.completed(result);
        }
Async Task for downloading and initializing HDR Image data into a Texture object on
the background thread.
android/viro_bridge/src/main/java/com/viromedia/bridge/utility/HdrImageDownloader.java