Add SkMatrix44::setColMajord, etc.

We have accessors for efficiently getting the matirx data, and it would be nice
if we had similar methods for setting the matrix entries.

Review URL: https://codereview.appspot.com/6851063

git-svn-id: http://skia.googlecode.com/svn/trunk@6494 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed