BUG=none
TEST=libyuvTest.ScaleTo1280x720_Linear
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/3829004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@853 16f28f9a-4ce2-e073-06de-1de4eb20be90