Alter Default & Software path renderers to better handle AA hairline paths

src/gpu/GrDefaultPathRenderer.cpp

Index: src/gpu/GrDefaultPathRenderer.cpp
diff --git a/src/gpu/GrDefaultPathRenderer.cpp b/src/gpu/GrDefaultPathRenderer.cpp
index 01e1a94adc8bd8e5603a83c6bd61ea1c9ad7f8ea..bd9b1ea16a38dfc948e54f8af60bd4bebda1f9d7 100644
--- a/src/gpu/GrDefaultPathRenderer.cpp
+++ b/src/gpu/GrDefaultPathRenderer.cpp
@@ -513,7 +513,7 @@ bool GrDefaultPathRenderer::canDrawPath(const SkPath& path,
                                         bool antiAlias) const {
     // this class can draw any path with any fill but doesn't do any anti-aliasing.
 
-    return !antiAlias &&
+    return !antiAlias && !(SkPath::kConic_SegmentMask & path.getSegmentMasks()) &&
         (stroke.isFillStyle() ||
          IsStrokeHairlineOrEquivalent(stroke, target->getDrawState().getViewMatrix(), NULL));
 }