fix bugs found by computing flat clips in 800K skps

tests/PathOpsAngleTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "PathOpsTestCommon.h"
 #include "SkIntersections.h"
 #include "SkOpSegment.h"
 #include "SkPathOpsTriangle.h"
@@ skipping 246 matching lines @@
                 PathOpsSegmentTester::ConstructLine(&segment[index], data.fShortPts);
                 break;
             case 3:
                 PathOpsSegmentTester::ConstructQuad(&segment[index], data.fShortPts);
                 break;
             case 4:
                 PathOpsSegmentTester::ConstructCubic(&segment[index], data.fShortPts);
                 break;
         }
     }
-    PathOpsAngleTester::Orderable(segment[0].angle(0), segment[1].angle(0));
+    PathOpsAngleTester::Orderable(*segment[0].debugLastAngle(), *segment[1].debugLastAngle());
 }
 
 struct IntersectData {
     const SkDCubic fPts;
     const int fPtCount;
     double fTStart;
     double fTEnd;
     SkPoint fShortPts[4];
 };
 
@@ skipping 153 matching lines @@
                     case 4: {
                         SkDCubic seg = SkDCubic::SubDivide(temp, data.fTStart, data.fTEnd);
                         data.fShortPts[0] = seg[0].asSkPoint();
                         data.fShortPts[1] = seg[1].asSkPoint();
                         data.fShortPts[2] = seg[2].asSkPoint();
                         data.fShortPts[3] = seg[3].asSkPoint();
                         PathOpsSegmentTester::ConstructCubic(&segment[index3], data.fShortPts);
                         } break;
                 }
             }
-            SkOpAngle& angle1 = const_cast<SkOpAngle&>(segment[0].angle(0));
-            SkOpAngle& angle2 = const_cast<SkOpAngle&>(segment[1].angle(0));
-            SkOpAngle& angle3 = const_cast<SkOpAngle&>(segment[2].angle(0));
+            SkOpAngle& angle1 = *const_cast<SkOpAngle*>(segment[0].debugLastAngle());
+            SkOpAngle& angle2 = *const_cast<SkOpAngle*>(segment[1].debugLastAngle());
+            SkOpAngle& angle3 = *const_cast<SkOpAngle*>(segment[2].debugLastAngle());
             PathOpsAngleTester::SetNext(angle1, angle3);
        // These data sets are seeded when the set itself fails, so likely the dataset does not
        // match the expected result. The tests above return 1 when first added, but
        // return 0 after the bug is fixed.
             SkDEBUGCODE(int result =) PathOpsAngleTester::After(angle2, angle1);
             SkASSERT(result == 0 || result == 1);
         }
     }
 }
 
@@ skipping 22 matching lines @@
     addT(NULL, shortQuad[1], 1);
     debugConstruct();
 }
 
 void SkOpSegment::debugConstructQuad(SkPoint shortQuad[3]) {
     addQuad(shortQuad, false, false);
     addT(NULL, shortQuad[0], 0);
     addT(NULL, shortQuad[2], 1);
     debugConstruct();
 }