BUG=204
TESTED=build\gyp_chromium -fninja -G msvs_version=2012 --depth=. libyuv_test.gyp & out\Release\psnr locally tested.
Review URL: https://webrtc-codereview.appspot.com/1216005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@612 16f28f9a-4ce2-e073-06de-1de4eb20be90