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chrome.storage.local.get('directory_ref', function(items) {
  var ref = items.directory_ref;

  chrome.fileSystem.restoreEntry(ref, function(storage) {
    var fileName = 'test.html';

    storage.getFile(fileName, { create: false }, function(fileEntry) {
      fileEntry.file(function(file) {

        var fileReader = new FileReader();

        fileReader.onloadend = function() {
          var dataUrl = fileReader.result;

          chrome.app.window.create('webview_demo.html', function(window) {
            window.dataUrl = dataUrl;
          });
        };

        fileReader.readAsDataURL(file);
      });
    });
  });
});

<script src="webview.js"></script>

<webview id="webview" src=""></webview>

var dataUrl = chrome.app.window.current().dataUrl,
    webview = document.getElementById('webview');

webview.src = dataUrl;