[svg2] Make 'cx', 'cy' and 'r' presentation attributes

Source/core/layout/style/SVGLayoutStyleDefs.h

 /*
     Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
                   2004, 2005 Rob Buis <buis@kde.org>
     Copyright (C) Research In Motion Limited 2010. All rights reserved.
 
     Based on khtml code by:
     Copyright (C) 2000-2003 Lars Knoll (knoll@kde.org)
               (C) 2000 Antti Koivisto (koivisto@kde.org)
               (C) 2000-2003 Dirk Mueller (mueller@kde.org)
               (C) 2002-2003 Apple Computer, Inc.
@@ skipping 256 matching lines @@
 // Positioning and sizing properties.
 class StyleLayoutData : public RefCounted<StyleLayoutData> {
     public:
         static PassRefPtr<StyleLayoutData> create() { return adoptRef(new StyleLayoutData); }
         PassRefPtr<StyleLayoutData> copy() const;
         bool operator==(const StyleLayoutData&) const;
         bool operator!=(const StyleLayoutData& other) const
         {
             return !(*this == other);
         }
+        Length cx;

[fs, 2015/03/09 12:34:33]

(Just a note) We're now at 7 * 8 = 56 bytes (payload only) for this structure -
most basic shapes will have a unique copy, while only using ~half (best case) of
the contents.

[Erik Dahlström (inactive), 2015/03/09 13:59:02]

Yes, we might want to compact or split this in the future. A rect vs
circle/ellipse split might be enough, my guess is that rect with rx,ry is more
common than ellipse elements with rx,ry.

Filed http://crbug.com/465341 for this.

+        Length cy;
         Length x;
         Length y;
+        Length r;
         Length rx;
         Length ry;
     private:
         StyleLayoutData();
         StyleLayoutData(const StyleLayoutData&);
     };
 
 } // namespace blink
 
 #endif // SVGLayoutStyleDefs_h