Set width of spinner's dropdown to fit on device

Commit for issue at
http://code.google.com/p/android/issues/detail?id=25916&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars&start=100



[Problem]
Dropdown popup of Spinner become wider than device's width if selected
item's content's width is larger than device's screen.

[Cause]
Spinner just display dropdown popup with measured content's width
although measured content's width is wider than device's screen.

[Solution]
If calculated content's width is wider than device's screen, set width
of spinner's dropdown popup to fit on device.

Change-Id: I3276e5ff745c6ba1437c07fc55645d6b53fef89a
Signed-off-by: SeongJae Park <sj38.park@gmail.com>