add asserts to point<-->verb helpers

src/pathops/SkReduceOrder.cpp

 /*
  * 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 "SkReduceOrder.h"
 
 int SkReduceOrder::reduce(const SkDLine& line) {
     fLine[0] = line[0];
@@ skipping 419 matching lines @@
     quad.set(a);
     SkReduceOrder reducer;
     int order = reducer.reduce(quad, kFill_Style);
     if (order == 2) {  // quad became line
         for (int index = 0; index < order; ++index) {
             SkPoint* pt = reducePts->append();
             pt->fX = SkDoubleToScalar(reducer.fLine[index].fX);
             pt->fY = SkDoubleToScalar(reducer.fLine[index].fY);
         }
     }
-    return (SkPath::Verb) (order - 1);
+    return SkPathOpsPointsToVerb(order - 1);
 }
 
 SkPath::Verb SkReduceOrder::Cubic(const SkPoint a[4], SkTDArray<SkPoint>* reducePts) {
     SkDCubic cubic;
     cubic.set(a);
     SkReduceOrder reducer;
     int order = reducer.reduce(cubic, kAllow_Quadratics, kFill_Style);
     if (order == 2 || order == 3) {  // cubic became line or quad
         for (int index = 0; index < order; ++index) {
             SkPoint* pt = reducePts->append();
             pt->fX = SkDoubleToScalar(reducer.fQuad[index].fX);
             pt->fY = SkDoubleToScalar(reducer.fQuad[index].fY);
         }
     }
-    return (SkPath::Verb) (order - 1);
+    return SkPathOpsPointsToVerb(order - 1);
 }