setting patch_primitive_nvprmsaa4 on K1 to ignore

TBR=
BUG=skia:

Review URL: https://codereview.chromium.org/743563003
change roundOut() to take a dst, so we can use that signature to return IRect

BUG=skia:
TBR=robertphilips

Review URL: https://codereview.chromium.org/731373003