Fix a bug in Nine Patch library. [DO NOT MERGE]

The nine patches were not drawn correctly if they were not positioned at
the top left corner of the canvas.

Bug: http://b.android.com/29959
Change-Id: Icfed522ea07322a3ee9f3955067d3da26c4b0b5b
(cherry-picked from 8a892279bd1b212311f4200f306a317985463918)
1 file changed