add SkChecksum as a static class, for the replacement API
after this lands, plan to deprecate/remove the older APIs
Review URL: https://codereview.appspot.com/6356059

git-svn-id: http://skia.googlecode.com/svn/trunk@4457 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed