ARGBcolorMatrix for applying transforms such as grey and sepia in a more general form.  Unittest does sepia for comparison.
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/656004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@288 16f28f9a-4ce2-e073-06de-1de4eb20be90