code: function resolveNative(success, fail, path, fsType, options, size) {
      window.webkitRequestFileSystem(
          fsType,
          size,
          function (fs) {
              if (path === '') {
                  //no path provided, call success with root file system
                  success(createEntryFromNative(fs.root));
              } else {
                  //otherwise attempt to resolve as file
                  fs.root.getFile(
                      path,
                      options,
                      function (entry) {
                          success(createEntryFromNative(entry));
                      },
                      function (fileError) {
                          //file not found, attempt to resolve as directory
                          fs.root.getDirectory(
                              path,
                              options,
                              function (entry) {
                                  success(createEntryFromNative(entry));
                              },
                              function (dirError) {
                                  //path cannot be resolved
                                  if (fileError.code === FileError.INVALID_MODIFICATION_ERR && 
                                      options.exclusive) {
                                      //mobile-spec expects this error code
                                      fail(FileError.PATH_EXISTS_ERR);
                                  } else {
                                      fail(FileError.NOT_FOUND_ERR);
                                  }
                              }
                          );
                      }
                  );
              }
          }
      );
  }
docs: find path using webkit file system