Bug 1083944 -  Implement screen reader quick navigation dialog

The menu is visible. You could actually test this patch.

1. Start the screen reader.
2. doubletap+hold (finger down + finger up + finger down + finger up + finger down)

This menu should pop up.

There is a fraction of a second at startup, where the menu won't work. I didn't think it was a big deal. In any case, I am changing it now, and it will always show the menu, and populate it as the setting comes in.