BUG=446
TESTED=libyuvTest.NV12Rotate180_Inverted
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/51169004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1420 16f28f9a-4ce2-e073-06de-1de4eb20be90