Roll 50: Updated for push to origin/master.

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

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 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) {
       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'] = s.join(' ');
+    _element.setAttribute('class', s.join(' '));
   }
 }
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   static final _START_TAG_REGEXP = new RegExp('<(\\w+)');
 
   factory $CLASSNAME.tag(String tag) =>
       document.createElementNS("http://www.w3.org/2000/svg", tag);
   factory $CLASSNAME.svg(String svg,
       {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
 
     if (validator == null && treeSanitizer == null) {
       validator = new NodeValidatorBuilder.common()..allowSvg();
     }
 
     final match = _START_TAG_REGEXP.firstMatch(svg);
     var parentElement;
     if (match != null && match.group(1).toLowerCase() == 'svg') {
       parentElement = document.body;
     } else {
       parentElement = new SvgSvgElement();
     }
     var fragment = parentElement.createFragment(svg, validator: validator,
         treeSanitizer: treeSanitizer);
     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);
 
   set children(List<Element> value) {
     final children = this.children;
     children.clear();
     children.addAll(value);
   }
 
   String get outerHtml {
@@ skipping 76 matching lines @@
     return e is $CLASSNAME && !(e is UnknownElement);
   }
 
 $if JSINTEROP
   set _svgClassName(AnimatedString value) =>
       _blink.BlinkSVGElement.instance.className_Setter_(this, value);
 
 $endif
 $!MEMBERS
 }