[SVG] Shared <use> path geometry

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

Index: third_party/WebKit/Source/core/svg/SVGPath.h
diff --git a/third_party/WebKit/Source/core/svg/SVGPath.h b/third_party/WebKit/Source/core/svg/SVGPath.h
index 5ca84a9dd2a30795d03cd46e554e11abd02604b7..0f9ac5b84d65d19b3d37552eb8d56e7f654887ff 100644
--- a/third_party/WebKit/Source/core/svg/SVGPath.h
+++ b/third_party/WebKit/Source/core/svg/SVGPath.h
@@ -36,6 +36,7 @@
 namespace blink {
 
 class ExceptionState;
+class Path;
 class SVGPathByteStream;
 
 class SVGPath : public SVGPropertyBase {
@@ -49,6 +50,8 @@ public:
 
     ~SVGPath() override;
 
+    const Path& path() const;
+
     const SVGPathByteStream& byteStream() const;
     SVGPathByteStream& mutableByteStream();
 
@@ -68,7 +71,11 @@ private:
     SVGPath();
     explicit SVGPath(PassOwnPtr<SVGPathByteStream>);
 
+    SVGPathByteStream& ensureByteStream();
+    void byteStreamWillChange();
+
     OwnPtr<SVGPathByteStream> m_byteStream;
+    mutable OwnPtr<Path> m_cachedPath;
 };
 
 inline PassRefPtrWillBeRawPtr<SVGPath> toSVGPath(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)