fix builder winding again

src/pathops/SkPathOpsWinding.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // given a prospective edge, compute its initial winding by projecting a ray
 // if the ray hits another edge
     // if the edge doesn't have a winding yet, hop up to that edge and start over
@@ skipping 335 matching lines @@
                 hitSegment->contour()->setCcw(ccw);
             } else {
                 (void) hitSegment->markAndChaseWinding(span, span->next(), windSum, oppSum, NULL);
                 (void) hitSegment->markAndChaseWinding(span->next(), span, windSum, oppSum, NULL);
             }
         }
         if (operand) {
             SkTSwap(wind, oppWind);
         }
         last = &hit->fPt;
+        this->globalState()->bumpNested();
     }
     return true;
 }
 
 SkOpSpan* SkOpSegment::findSortableTop(SkOpContour* contourHead) {
     SkOpSpan* span = &fHead;
     SkOpSpanBase* next;
     do {
         next = span->next();
         if (span->done()) {
@@ skipping 31 matching lines @@
                 continue;
             }
             SkOpSpan* result = contour->findSortableTop(contourHead);
             if (result) {
                 return result;
             }
         } while ((contour = contour->next()));
     }
     return NULL;
 }