BUG=331
TESTED=libyuv_unittest --gunit_also_run_disabled_tests --gtest_filter=**.ScaleFrom1280x720*
R=debargha@google.com, tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/17569004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1005 16f28f9a-4ce2-e073-06de-1de4eb20be90