Adding more unit testing for SkCanvas and derived classes.

BUG=http://code.google.com/p/skia/issues/detail?id=481
REVIEW=http://codereview.appspot.com/5674077/
TEST=unit test CanvasTest



git-svn-id: http://skia.googlecode.com/svn/trunk@3228 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed