Use PathSegmentData+SVGPath{Consumer,Source} in PathSVGInterpolation

third_party/WebKit/Source/core/svg/SVGPathSegList.h

Index: third_party/WebKit/Source/core/svg/SVGPathSegList.h
diff --git a/third_party/WebKit/Source/core/svg/SVGPathSegList.h b/third_party/WebKit/Source/core/svg/SVGPathSegList.h
index cb674184d2314913ce0849d6c6cd622757563633..159c3eaab8765b5590d12c95bb287a8d9efdf059 100644
--- a/third_party/WebKit/Source/core/svg/SVGPathSegList.h
+++ b/third_party/WebKit/Source/core/svg/SVGPathSegList.h
@@ -60,7 +60,8 @@ public:
 
     ~SVGPathSegList() override;
 
-    const SVGPathByteStream* byteStream() const;
+    const SVGPathByteStream& byteStream() const;
+    SVGPathByteStream& mutableByteStream();
     void clearByteStream() { m_byteStream.clear(); }
 
     // SVGListPropertyHelper methods with |m_byteStream| sync:
@@ -147,6 +148,8 @@ public:
 
     DECLARE_VIRTUAL_TRACE();
 
+    void invalidateList();
+
 private:
     explicit SVGPathSegList(SVGPathElement*);
     SVGPathSegList(SVGPathElement*, PassOwnPtr<SVGPathByteStream>);
@@ -159,7 +162,6 @@ private:
     }
 
     void updateListFromByteStream();
-    void invalidateList();
 
     // FIXME: This pointer should be removed after SVGPathSeg has a tear-off.
     //