Move seg_to to a new header, define SkSegType enum there

src/utils/SkCurveMeasure.h

Index: src/utils/SkCurveMeasure.h
diff --git a/src/utils/SkCurveMeasure.h b/src/utils/SkCurveMeasure.h
index 60de29e7a4643abd6aec587c41028b43ace57a27..b2d0ea17f3d4d2d2a8b600ebbe654968374cf91a 100644
--- a/src/utils/SkCurveMeasure.h
+++ b/src/utils/SkCurveMeasure.h
@@ -8,6 +8,7 @@
 #ifndef SkCurveMeasure_DEFINED
 #define SkCurveMeasure_DEFINED
 
+#include "SkPathMeasurePriv.h"
 #include "SkPoint.h"
 #include "SkNx.h"
 
@@ -26,14 +27,6 @@ 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() {}