fix pathops skp-derived bugs; add more failing tests

src/pathops/SkOpSegment.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.
  */
 #ifndef SkOpSegment_DEFINE
 #define SkOpSegment_DEFINE
 
 #include "SkOpAngle.h"
@@ skipping 159 matching lines @@
     const SkPoint* pts() const {
         return fPts;
     }
 
     void reset() {
         init(NULL, (SkPath::Verb) -1, false, false);
         fBounds.set(SK_ScalarMax, SK_ScalarMax, SK_ScalarMax, SK_ScalarMax);
         fTs.reset();
     }
 
+    bool reversePoints(const SkPoint& p1, const SkPoint& p2) const;
+
     void setOppXor(bool isOppXor) {
         fOppXor = isOppXor;
     }
 
     void setUpWinding(int index, int endIndex, int* maxWinding, int* sumWinding) {
         int deltaSum = spanSign(index, endIndex);
         *maxWinding = *sumWinding;
         *sumWinding -= deltaSum;
     }
 
@@ skipping 354 matching lines @@
     bool fSmall;  // set if some span is small
     bool fTiny;  // set if some span is tiny
 #if defined(SK_DEBUG) || !FORCE_RELEASE
     int fID;
 #endif
 
     friend class PathOpsSegmentTester;
 };
 
 #endif