fix addArc to not wrap around if the sweepAngle is close to 360 but lost
precision when convert to radians (and then to unit vectors ala sin/cos)
git-svn-id: http://skia.googlecode.com/svn/trunk@495 2bbb7eff-a529-9590-31e7-b0007b416f81
use internal mutable version of drawPath when we've cons'd up a path on behalf
of a rect
git-svn-id: http://skia.googlecode.com/svn/trunk@258 2bbb7eff-a529-9590-31e7-b0007b416f81