working on initial winding for cubics

src/pathops/SkPathOpsPoint.h

Index: src/pathops/SkPathOpsPoint.h
diff --git a/src/pathops/SkPathOpsPoint.h b/src/pathops/SkPathOpsPoint.h
index 35ad80ea4cc8bd572c07d9704997b18776b8c87d..c596b91cc09b28d7fbb6b96b112a3279aafc2837 100644
--- a/src/pathops/SkPathOpsPoint.h
+++ b/src/pathops/SkPathOpsPoint.h
@@ -115,6 +115,20 @@ struct SkDPoint {
         fY -= v.fY;
     }
 
+    // only used by testing
+    SkDPoint operator+(const SkDVector& v) {
+        SkDPoint result = *this;
+        result += v;
+        return result;
+    }
+
+    // only used by testing
+    SkDPoint operator-(const SkDVector& v) {
+        SkDPoint result = *this;
+        result -= v;
+        return result;
+    }
+
     // note: this can not be implemented with
     // return approximately_equal(a.fY, fY) && approximately_equal(a.fX, fX);
     // because that will not take the magnitude of the values into account