fix path op conic bugs

src/pathops/SkOpContour.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkOpContour_DEFINED
 #define SkOpContour_DEFINED
 
 #include "SkOpSegment.h"
@@ skipping 379 matching lines @@
         } while ((segment = segment->next()));
     }
 
     const SkPoint& start() const {
         return fHead.pts()[0];
     }
 
     void toPartialBackward(SkPathWriter* path) const {
         const SkOpSegment* segment = fTail;
         do {
-            segment->addCurveTo(segment->tail(), segment->head(), path, true);
+            SkAssertResult(segment->addCurveTo(segment->tail(), segment->head(), path));
         } while ((segment = segment->prev()));
     }
 
     void toPartialForward(SkPathWriter* path) const {
         const SkOpSegment* segment = &fHead;
         do {
-            segment->addCurveTo(segment->head(), segment->tail(), path, true);
+            SkAssertResult(segment->addCurveTo(segment->head(), segment->tail(), path));
         } while ((segment = segment->next()));
     }
 
     void toReversePath(SkPathWriter* path) const;
     void toPath(SkPathWriter* path) const;
     SkOpSegment* undoneSegment(SkOpSpanBase** startPtr, SkOpSpanBase** endPtr);
 
 private:
     SkOpGlobalState* fState;
     SkOpSegment fHead;
     SkOpSegment* fTail;
     SkOpContour* fNext;
     SkPathOpsBounds fBounds;
     int fCcw;
     int fCount;
     int fFirstSorted;
     bool fDone;  // set by find top segment
     bool fOperand;  // true for the second argument to a binary operator
     bool fReverse;  // true if contour should be reverse written to path (used only by fix winding)
     bool fXor;  // set if original path had even-odd fill
     bool fOppXor;  // set if opposite path had even-odd fill
     SkDEBUGCODE(int fID);
     SkDEBUGCODE(mutable int fDebugIndent);
 };
 
 class SkOpContourHead : public SkOpContour {
 };
 
 #endif