code: function reloadDoc(doc) {
  
          var promise = FileUtils.readAsText(doc.file);
  
          promise.done(function (text, readTimestamp) {
              doc.refreshText(text, readTimestamp);
          });
          promise.fail(function (error) {
              console.log("Error reloading contents of " + doc.file.fullPath, error);
          });
          return promise;
      }
docs: Reloads the Document's contents from disk, discarding any unsaved changes in the editor.
  
  @param {!Document} doc
  @return {$.Promise} Resolved after editor has been refreshed; rejected if unable to load the
  file's new content. Errors are logged but no UI is shown.