add helper to create fancy underlines

src/pathops/SkDQuadLineIntersection.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkIntersections.h"
 #include "SkPathOpsLine.h"
 #include "SkPathOpsQuad.h"
 
@@ skipping 424 matching lines @@
 
 int SkIntersections::HorizontalIntercept(const SkDQuad& quad, SkScalar y, double* roots) {
     LineQuadraticIntersections q(quad);
     return q.horizontalIntersect(y, roots);
 }
 
 int SkIntersections::VerticalIntercept(const SkDQuad& quad, SkScalar x, double* roots) {
     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);
+}