add asserts to point<-->verb helpers

src/pathops/SkOpContour.h

Index: src/pathops/SkOpContour.h
diff --git a/src/pathops/SkOpContour.h b/src/pathops/SkOpContour.h
index c90c2183446c972873e6fdb4fffdf338e7f001c4..c57fbac6cae9bb2511ba5e1aa485658c51120917 100644
--- a/src/pathops/SkOpContour.h
+++ b/src/pathops/SkOpContour.h
@@ -114,7 +114,7 @@ public:
 
     const SkPoint& end() const {
         const SkOpSegment& segment = fSegments.back();
-        return segment.pts()[segment.verb()];
+        return segment.pts()[SkPathOpsVerbToPoints(segment.verb())];
     }
 
     void findTooCloseToCall() {
@@ -195,7 +195,7 @@ public:
     int updateSegment(int index, const SkPoint* pts) {
         SkOpSegment& segment = fSegments[index];
         segment.updatePts(pts);
-        return segment.verb() + 1;
+        return SkPathOpsVerbToPoints(segment.verb()) + 1;
     }
 
 #if DEBUG_TEST