fix bugs found by computing flat clips in 800K skps

src/pathops/SkIntersectionHelper.h

 /*
  * 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 "SkOpContour.h"
 #include "SkPath.h"
 
 #ifdef SK_DEBUG
@@ skipping 36 matching lines @@
     }
 
     int addSelfT(const SkPoint& pt, double newT) {
         return fContour->addSelfT(fIndex, pt, newT);
     }
 
     bool advance() {
         return ++fIndex < fLast;
     }
 
+    void alignTPt(SkIntersectionHelper& other, bool swap, int index,
+            SkIntersections* ts, SkPoint* point) {
+        fContour->alignTPt(fIndex, other.fContour, other.fIndex, swap, index, ts, point);
+    }
+
     SkScalar bottom() const {
         return bounds().fBottom;
     }
 
     const SkPathOpsBounds& bounds() const {
         return fContour->segments()[fIndex].bounds();
     }
 
     void init(SkOpContour* contour) {
         fContour = contour;
@@ skipping 75 matching lines @@
     }
 
 private:
     // utility callable by the user from the debugger when the implementation code is linked in
     void dump() const;
 
     SkOpContour* fContour;
     int fIndex;
     int fLast;
 };