Roll 50: Updated for push to origin/master.

tools/dom/templates/html/impl/impl_SVGElement.darttemplate

Index: tools/dom/templates/html/impl/impl_SVGElement.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_SVGElement.darttemplate b/tools/dom/templates/html/impl/impl_SVGElement.darttemplate
index 886d783376fee336dd16049b44910c1ccdf9516c..384aac70fab5c844332cb3e603eb4e9f661403e0 100644
--- a/tools/dom/templates/html/impl/impl_SVGElement.darttemplate
+++ b/tools/dom/templates/html/impl/impl_SVGElement.darttemplate
@@ -4,13 +4,16 @@
 
 part of $LIBRARYNAME;
 
-class _AttributeClassSet extends CssClassSetImpl {
+class AttributeClassSet extends CssClassSetImpl {
   final Element _element;
 
-  _AttributeClassSet(this._element);
+  AttributeClassSet(this._element);
 
   Set<String> readClasses() {
     var classname = _element.attributes['class'];
+    if (classname is AnimatedString) {
+      classname = classname.baseVal;
+    }
 
     Set<String> s = new LinkedHashSet<String>();
     if (classname == null) {
@@ -26,7 +29,7 @@ class _AttributeClassSet extends CssClassSetImpl {
   }
 
   void writeClasses(Set s) {
-    _element.attributes['class'] = s.join(' ');
+    _element.setAttribute('class', s.join(' '));
   }
 }
 
@@ -54,7 +57,7 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
     return fragment.nodes.where((e) => e is SvgElement).single;
   }
 
-  CssClassSet get classes => new _AttributeClassSet(this);
+  CssClassSet get classes => new AttributeClassSet(this);
 
   List<Element> get children => new FilteredElementList(this);