Revert of pathops version two

src/pathops/SkPathOpsLine.h

Index: src/pathops/SkPathOpsLine.h
diff --git a/src/pathops/SkPathOpsLine.h b/src/pathops/SkPathOpsLine.h
index bb2516286013e0784f2d4e8a31a5b2aebcdf1993..74eb6153488814e7a3ad41cdec71f9b4a0ab1030 100644
--- a/src/pathops/SkPathOpsLine.h
+++ b/src/pathops/SkPathOpsLine.h
@@ -20,20 +20,27 @@
         fPts[1] = pts[1];
     }
 
+    static SkDLine SubDivide(const SkPoint a[2], double t1, double t2) {
+        SkDLine line;
+        line.set(a);
+        return line.subDivide(t1, t2);
+    }
+
     double exactPoint(const SkDPoint& xy) const;
     static double ExactPointH(const SkDPoint& xy, double left, double right, double y);
     static double ExactPointV(const SkDPoint& xy, double top, double bottom, double x);
-
-    // only used by testing
     double isLeft(const SkDPoint& pt) const;
-
     double nearPoint(const SkDPoint& xy, bool* unequal) const;
     bool nearRay(const SkDPoint& xy) const;
     static double NearPointH(const SkDPoint& xy, double left, double right, double y);
     static double NearPointV(const SkDPoint& xy, double top, double bottom, double x);
+    static bool NearRay(double dx1, double dy1, double dx2, double dy2);
     SkDPoint ptAtT(double t) const;
+    SkDLine subDivide(double t1, double t2) const;
 
     void dump() const;
+private:
+    SkDVector tangent() const { return fPts[0] - fPts[1]; }
 };
 
 #endif