[SVG] Shared <use> path geometry

third_party/WebKit/Source/core/svg/SVGPathElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGPathElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGPathElement.cpp b/third_party/WebKit/Source/core/svg/SVGPathElement.cpp
index 8a26824bbabad397c0903c1a668485173d08e32e..94b22165159e02ad9d8de000a9ad1fec3e481ea4 100644
--- a/third_party/WebKit/Source/core/svg/SVGPathElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGPathElement.cpp
@@ -72,9 +72,11 @@ DEFINE_NODE_FACTORY(SVGPathElement)
 
 Path SVGPathElement::asPath() const
 {
-    Path path;
-    buildPathFromByteStream(pathByteStream(), path);
-    return path;
+    // If this is a <use> instance, return the referenced path to maximize geometry sharing.
+    if (const SVGElement* element = correspondingElement())
+        return toSVGPathElement(element)->asPath();
+
+    return m_path->currentValue()->path();
 }
 
 float SVGPathElement::getTotalLength()