pin the edge points to the clip, rather than just calling clamp_ge/le in the quad chopper. This fixes some gaps we were seeing when the float match lost precisions.
pin the edge points to the clip, rather than just calling clamp_ge/le in the
quad chopper. This fixes some gaps we were seeing when the float match lost
precisions.

fixes http://code.google.com/p/skia/issues/detail?id=533



csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia