BUG=265
TEST=untested
R=thorcarpenter@google.com, yunqingwang@google.com

Review URL: https://webrtc-codereview.appspot.com/2166004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@780 16f28f9a-4ce2-e073-06de-1de4eb20be90