base

Make KEYCODE_SPACE a confirm key.

By default space should "click" the focused item. This behavior also
applies to GridView and ListView if the items are clickable, but will
continue the previous behavior of scrolling if it's just a list of
items you can't really interact with.

Change-Id: Ic3a0334614d1dc68ff98bc4b1fb1ae2f961f71af