Following up from bug #193048, we should add test for the following tab cycling cases:
1. text field to <select>
2. <select> to <select>
3. <select> to text field.
4. <select> to Chrome
(Ideally, we would also try to write these tests to work on Mac. It may be hard without updating Mac test infrastructure to support sending events to AppKit menus. I haven't checked the code lately though. Maybe we already support this?)