Fix date and time picker styling

Removes done buttons from widgets, fixes date picker day selection, fixes
dialog layouts in landscape, updates colors. Adds API on AlertDialog for
setting the view by resource ID, which is necessary to correctly inflate
the view against the dialog's parent view.

BUG: 16941550
BUG: 16852521
BUG: 16878697
BUG: 16838659
BUG: 17047435
Change-Id: I138858ce06cd4abf68a2c3361ec170370236b33b