[SVG] Shared <use> path geometry

third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h b/third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h
index a351fec03e5e563557281f2c0a577f4c02167ac8..26a836537c13bf616ad55059be80f65e7bb84ee9 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGShape.h
@@ -130,6 +130,9 @@ private:
 
 private:
     OwnPtr<AffineTransform> m_localTransform;
+    // TODO(fmalita): the Path is now cached in SVGPath; while this additional cache is just a

[fs, 2015/10/30 09:48:34]

When (if) we manage to turn 'd' into a property well essentially be carry a Path
in ComputedStyle, so hopefully that would fix some part of this. There's still
the cases of all the non-<path> geometries that we turn into Paths for various
reasons, so I guess we need to think some more about that...

+    // shallow copy, it certainly has a complexity/state management cost (plus allocation & storage
+    // overhead) - so we should look into removing it.
     OwnPtr<Path> m_path;
     mutable OwnPtr<LayoutSVGShapeRareData> m_rareData;