Fixing SVGElement.classes.

sdk/lib/svg/dart2js/svg_dart2js.dart

 library svg;
 
 import 'dart:html';
 // DO NOT EDIT
 // Auto-generated dart:svg library.
 
 
 
 
 
@@ skipping 1072 matching lines @@
 
 class _AttributeClassSet extends CssClassSet {
   final Element _element;
 
   _AttributeClassSet(this._element);
 
   Set<String> readClasses() {
     var classname = _element.attributes['class'];
 
     Set<String> s = new Set<String>();
+    if (classname == null) {
+      return s;
+    }
     for (String name in classname.split(' ')) {
       String trimmed = name.trim();
       if (!trimmed.isEmpty) {
         s.add(trimmed);
       }
     }
     return s;
   }
 
   void writeClasses(Set s) {
-    _element.attributes['class'] = _formatSet(s);
+    List list = new List.from(s);
+    _element.attributes['class'] = Strings.join(list, ' ');
   }
 }
 
 class SVGElement extends Element native "*SVGElement" {
   factory SVGElement.tag(String tag) =>
       _SVGElementFactoryProvider.createSVGElement_tag(tag);
   factory SVGElement.svg(String svg) =>
       _SVGElementFactoryProvider.createSVGElement_svg(svg);
 
+  _AttributeClassSet _cssClassSet;
   CssClassSet get classes {
     if (_cssClassSet == null) {
-      _cssClassSet = new _AttributeClassSet(_ptr);
+      _cssClassSet = new _AttributeClassSet(this);
     }
     return _cssClassSet;
   }
 
   List<Element> get elements => new FilteredElementList(this);
 
   void set elements(Collection<Element> value) {
     final elements = this.elements;
     elements.clear();
     elements.addAll(value);
@@ skipping 4897 matching lines @@
   }
 
   List<SVGElementInstance> getRange(int start, int rangeLength) =>
       _Lists.getRange(this, start, rangeLength, <SVGElementInstance>[]);
 
   // -- end List<SVGElementInstance> mixins.
 
   /** @domName SVGElementInstanceList.item */
   SVGElementInstance item(int index) native;
 }