fix bugs found by computing flat clips in 800K skps

src/pathops/SkPathOpsLine.h

Index: src/pathops/SkPathOpsLine.h
diff --git a/src/pathops/SkPathOpsLine.h b/src/pathops/SkPathOpsLine.h
index e4ed0c9b207a38fc48f696d7ca71658d8542ce79..74eb6153488814e7a3ad41cdec71f9b4a0ab1030 100644
--- a/src/pathops/SkPathOpsLine.h
+++ b/src/pathops/SkPathOpsLine.h
@@ -30,7 +30,7 @@ struct SkDLine {
     static double ExactPointH(const SkDPoint& xy, double left, double right, double y);
     static double ExactPointV(const SkDPoint& xy, double top, double bottom, double x);
     double isLeft(const SkDPoint& pt) const;
-    double nearPoint(const SkDPoint& xy) 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);