BUG=307
TESTED=untested
R=michaelbai@chromium.org, noahric@chromium.org, yfriedman@chromium.org

Review URL: https://webrtc-codereview.appspot.com/7089005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@970 16f28f9a-4ce2-e073-06de-1de4eb20be90