add helper to create fancy underlines

src/pathops/SkDQuadLineIntersection.cpp

Index: src/pathops/SkDQuadLineIntersection.cpp
diff --git a/src/pathops/SkDQuadLineIntersection.cpp b/src/pathops/SkDQuadLineIntersection.cpp
index 64eb86848e8270f24ece2815fab87a47c43fd3fc..a3d10bc9ff108a09bedba6ae4c2dace2bee7b487 100644
--- a/src/pathops/SkDQuadLineIntersection.cpp
+++ b/src/pathops/SkDQuadLineIntersection.cpp
@@ -442,3 +442,13 @@ int SkIntersections::VerticalIntercept(const SkDQuad& quad, SkScalar x, double*
     LineQuadraticIntersections q(quad);
     return q.verticalIntersect(x, roots);
 }
+
+// SkDQuad accessors to Intersection utilities
+
+int SkDQuad::horizontalIntersect(double yIntercept, double roots[2]) const {
+    return SkIntersections::HorizontalIntercept(*this, yIntercept, roots);
+}
+
+int SkDQuad::verticalIntersect(double xIntercept, double roots[2]) const {
+    return SkIntersections::VerticalIntercept(*this, xIntercept, roots);
+}