title: Get full path of a file open using chrome.fileSystem.chooseEntry
body: <p>I want to know if there's any way to get the full path of a fileEntry using the <code>chrome.fileSystem.chooseEntry</code>. I've tried to use <code>chrome.fileSystem.getFullPath</code> but it returns a null string.
  What should I do to get the full path of a fileEntry?</p>
  
  <p>Thanks</p>