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

Source/core/layout/style/SVGLayoutStyleDefs.h

Index: Source/core/layout/style/SVGLayoutStyleDefs.h
diff --git a/Source/core/layout/style/SVGLayoutStyleDefs.h b/Source/core/layout/style/SVGLayoutStyleDefs.h
index 3bd1bcbf2aa792cd059e9261cefea8765dbb82ca..627b6ee15791ebf5b87d660b785bdb49ac2801db 100644
--- a/Source/core/layout/style/SVGLayoutStyleDefs.h
+++ b/Source/core/layout/style/SVGLayoutStyleDefs.h
@@ -274,8 +274,11 @@ class StyleLayoutData : public RefCounted<StyleLayoutData> {
         {
             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: