onParseFailure = function(message) {
                    log(qq.format("EXIF header parse failed: '{}' ", message));
                    parser.failure(message);
                }
Attempt to parse the EXIF header for the `Blob` associated with this instance.

@returns {qq.Promise} To be fulfilled when the parsing is complete.
If successful, the parsed EXIF header as an object will be included.