git-svn-id: http://skia.googlecode.com/svn/trunk@5561 2bbb7eff-a529-9590-31e7-b0007b416f81
add quartic solution for intersecting quadratics git-svn-id: http://skia.googlecode.com/svn/trunk@5541 2bbb7eff-a529-9590-31e7-b0007b416f81