Port the SVG code to the wrapperless DOM.

client/html/src/shared_FactoryProviders.dart

Index: client/html/src/shared_FactoryProviders.dart
diff --git a/client/html/src/shared_FactoryProviders.dart b/client/html/src/shared_FactoryProviders.dart
index 7e13bfb10440002713c535bf158bdba37492b57a..90807d8150711b0723b86c142d84c6a244f559e1 100644
--- a/client/html/src/shared_FactoryProviders.dart
+++ b/client/html/src/shared_FactoryProviders.dart
@@ -120,15 +120,44 @@ class _DocumentFragmentFactoryProvider {
   //   return fragment;
   // }
 
-  // TODO(nweiz): enable this when SVG is ported.
-  // factory DocumentFragment.svg(String svg) {
-  //   final fragment = new DocumentFragment();
-  //   final e = new SVGSVGElement();
-  //   e.innerHTML = svg;
-  //
-  //   // Copy list first since we don't want liveness during iteration.
-  //   final List nodes = new List.from(e.nodes);
-  //   fragment.nodes.addAll(nodes);
-  //   return fragment;
-  // }
+  factory DocumentFragment.svg(String svg) {
+    final fragment = new DocumentFragment();
+    final e = new SVGSVGElement();
+    e.innerHTML = svg;
+
+    // Copy list first since we don't want liveness during iteration.
+    final List nodes = new List.from(e.nodes);
+    fragment.nodes.addAll(nodes);
+    return fragment;
+  }
+}
+
+class _SVGElementFactoryProvider {
+  factory SVGElement.tag(String tag) =>
+    _document._createElementNS("http://www.w3.org/2000/svg", tag);
+
+  factory SVGElement.svg(String svg) {
+    Element parentTag;
+    final match = _START_TAG_REGEXP.firstMatch(svg);
+    if (match != null && match.group(1).toLowerCase() == 'svg') {
+      parentTag = new Element.tag('div');
+    } else {
+      parentTag = new SVGSVGElement();
+    }
+
+    parentTag.innerHTML = svg;
+    if (parentTag.elements.length == 1) return parentTag.nodes.removeLast();
+
+    throw new IllegalArgumentException('SVG had ${parentTag.elements.length} ' +
+        'top-level elements but 1 expected');
+  }
+}
+
+class _SVGSVGElementFactoryProvider {
+  factory SVGSVGElement() {
+    final el = new SVGElement.tag("svg");
+    // The SVG spec requires the version attribute to match the spec version
+    el.attributes['version'] = "1.1";
+    return el;
+  }
 }