code: function _getStats(uri) {
          return new FileSystemStats({
              isFile: true,
              mtime: SESSION_START_TIME.toISOString(),
              size: 0,
              realPath: uri,
              hash: uri
          });
      }
docs: Create a new file stat. See the FileSystemStats class for more details.
  
  @param {!string} fullPath The full path for this File.
  @return {FileSystemStats} stats.