function calcProcessed() {
			var processed = 0;

			_chunks.each(function(item) {
				if (item.state === Queueable.DONE) {
					processed += (item.end - item.start);
				}
			});

			return processed;
		}
When send_file_name is set to true, will be sent with the request as `name` param. 
            Can be used on server-side to override original file name.

            @property name
			@type {String}