Move seg_to to a new header, define SkSegType enum there

src/utils/SkCurveMeasure.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCurveMeasure_DEFINED
 #define SkCurveMeasure_DEFINED
 
+#include "SkPathMeasurePriv.h"
 #include "SkPoint.h"
 #include "SkNx.h"
 
 // These are weights and abscissae for gaussian quadrature with weight function
 // w(x) = 1
 static SkScalar weights8[8] = {0.3626837833783620f, 0.3626837833783620f,
                                0.3137066458778873f, 0.3137066458778873f,
                                0.2223810344533745f, 0.2223810344533745f,
                                0.1012285362903763f, 0.1012285362903763f};
 static SkScalar absc8[8] = {-0.1834346424956498f, 0.1834346424956498f,
                             -0.5255324099163290f, 0.5255324099163290f,
                             -0.7966664774136267f, 0.7966664774136267f,
                             -0.9602898564975363f, 0.9602898564975363f};
 
 static Sk8f weights = Sk8f::Load(weights8);
 static Sk8f absc = 0.5f*(Sk8f::Load(absc8) + 1.0f);
 
 
-// this is the same enum as in SkPathMeasure but it doesn't have a name there
-enum SkSegType {
-    kLine_SegType,
-    kQuad_SegType,
-    kCubic_SegType,
-    kConic_SegType,
-};
-
 class ArcLengthIntegrator {
 public:
     ArcLengthIntegrator() {}
     ArcLengthIntegrator(const SkPoint* pts, SkSegType segType);
     SkScalar computeLength(SkScalar t);
 
 private:
     SkSegType fSegType;
 
     // precomputed coefficients for derivatives in Horner form
@@ skipping 25 matching lines @@
     SkSegType fSegType;
     SkPoint fPts[4];
     SkScalar fLength = -1.0f;
     ArcLengthIntegrator fIntegrator;
 
     // for debug purposes
     int fIters;
 };
 
 #endif  // SkCurveMeasure_DEFINED