When picking images or videos, hide the titles in recents, since the
thumbnails should speak for themselves. Also respect new flag that
allows a directory to request their titles be hidden.
Show directory icon hint in grid mode when showing a thumbnail, to
remind user it's a directory.
Filter directories out of recents. Hide most action bar icons on
phones, even when room. Only show drawer on first launch. Hide most
drawer headers to match spec.
Bug: 10710331
Change-Id: I0ef1973ddd62750f57345336388366eda1449720
f6db154975