Untitled

chrome.app.runtime.onLaunched.addListener(function() {
  chrome.app.window.create('admin/admin.php', {
    'outerBounds': {
      'width': 400,
      'height': 500
    }
  });
});

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
</head>
<body>
  <h1>Hello, let's code!</h1>
</body>
</html>
  <script src='../libraries/jquery.min.js'></script>
  <script src='test.js'></script>

console.log('Did it load?')
$.ajax({
    url: '../server/admin.php'
}).done(function (data) {
$('body').html(data)
})