BUG=336
TESTED=out\release_x64\libyuv_unittest --gunit_also_run_disabled_tests --gtest_filter=*I420To*B*
R=bryan.bernhart@intel.com, tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/15809005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1018 16f28f9a-4ce2-e073-06de-1de4eb20be90