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chromium/android_webview/test/data/autofill/form_with_datalist.html 

<html>
  <body>
    <form action='a.html' name='formname'>
      <input type='text' id='text1' name='username'>
      <input list='datalist_id' name='count' id='text2'/>
        <datalist id='datalist_id'>
          <option value='A1'>one</option>
          <option value='A2'>two</option>
        </datalist>
    </form>
  </body>
</html>