BUG=none
TEST=planar_unitest updates
R=johannkoenig@google.com, ryanpetrie@google.com, thorcarpenter@google.com

Review URL: https://webrtc-codereview.appspot.com/2320008

git-svn-id: http://libyuv.googlecode.com/svn/trunk@805 16f28f9a-4ce2-e073-06de-1de4eb20be90