Add a map homogenous points to SkMatrix

BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/22330004

git-svn-id: http://skia.googlecode.com/svn/trunk@10659 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed