InputWrapper: opt out early if session == null

Change-Id: If111195ba6425ad6b8663601566f9f260738ec77
(2/3) FB: Add Dialpad key padding

Add top and bottom padding to Dialpad number keys to make the layout seem
        less crowded.

Change-Id: I04f02963da82df5ebfbfa2936c3060355169b479
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4