Add homogeneous point mapping to Matrix

Adds mapping of homogeneous points (points with three scalar components,
where the last component is not 1). Includes fix for tests when
running on 32 bit debug builds

BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/22816005

git-svn-id: http://skia.googlecode.com/svn/trunk/src@10755 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed