Fix artifacts on tiny stroked paths scaled up a lot.

Set doConsumeDegenerates to false when calling SkPath::Iter::next() for
all paths which are not in screen space. These lines are not degenerate
for world space paths.

Note: this change fixes only GrTessellatingPathRenderer and
GrDefaultPathRenderer. GrMSAAPathRenderer still exhibits the bug.

Bug: skia:6987
Change-Id: Ie3d494703211925c77052c68513948484e341486
Reviewed-on: https://skia-review.googlesource.com/37522
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
4 files changed