NumberPicker incorrectly shown for the old theme.

1. NumberPicker is trying to greedily grow to its max size
   but if the max size is not specified the default value
   was the max integer which makes the widget get quite
   tall in some cases. Now the widget tries to reach the
   max size only if it has been specified.

2. NumberPicker was not computing its min width when the array
   of display values is set.

3. DatePicker' layout for the old Theme was adding a margin on
   the right of the group of spinners and if the calendar view
   is not shown the spinners were not centered. Added the spinners
   right margin to the left margin of the calendar view.

4. TimePickerDialog was using the wrong conext and was not dismissable
   on an outside touch. Same for the DatePickerDialog context.

bug:5646161

Change-Id: Ic15f9b3e6291b76493604230ceb4f783a04d4ac7