Review URL: https://codereview.appspot.com/5909063 git-svn-id: http://skia.googlecode.com/svn/trunk@3494 2bbb7eff-a529-9590-31e7-b0007b416f81
add unittest for the above change git-svn-id: http://skia.googlecode.com/svn/trunk@2722 2bbb7eff-a529-9590-31e7-b0007b416f81