Reland r5861 but leave setMatrixClip virtual on SkDevice (IOW this is a partial revert of r5871 which reverted r5861).

Unreviewed
Review URL: https://codereview.appspot.com/6631062

git-svn-id: http://skia.googlecode.com/svn/trunk@5881 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed