dual panel mode [2/2]

i apologize that i dont' know where this feature is originally from. the author
from the commit this pairs with is benjamingoodwin <benjamin.j.goodwin@gmail.com>.
i think it came from AOKP originally.

Change-Id: I0a0736705b392594c6a5c604d61e33c6448c8caa
Merge "dual panel mode [2/2]" into kk44