BUG=none
TEST=*Scale* unittests
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1599005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@716 16f28f9a-4ce2-e073-06de-1de4eb20be90