BUG=chromium:344505, chromium:373739
R=kjellander@google.com, mflodman@chromium.org

Review URL: https://webrtc-codereview.appspot.com/14849004

Patch from Sergey Matveev <earthdok@chromium.org>.

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1028 16f28f9a-4ce2-e073-06de-1de4eb20be90