Add a couple useful SVG constructors.

client/html/src/SVGElementWrappingImplementation.dart

Index: client/html/src/SVGElementWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_SVGElementWrappingImplementation.dart b/client/html/src/SVGElementWrappingImplementation.dart
similarity index 82%
rename from client/html/generated/src/wrapping/_SVGElementWrappingImplementation.dart
rename to client/html/src/SVGElementWrappingImplementation.dart
index 368024817abaacb1f8b677ca19abd958f8782ed6..71203a4a513cb8d7a983d664f44e7dafb09f8ed1 100644
--- a/client/html/generated/src/wrapping/_SVGElementWrappingImplementation.dart
+++ b/client/html/src/SVGElementWrappingImplementation.dart
@@ -2,11 +2,13 @@
 // 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.
 
-// WARNING: Do not edit - generated code.
-
 class SVGElementWrappingImplementation extends ElementWrappingImplementation implements SVGElement {
   SVGElementWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  factory SVGElementWrappingImplementation.tag(String tag) =>
+    LevelDom.wrapSVGElement(dom.document.createElementNS(
+        "http://www.w3.org/2000/svg", tag));
+
   String get id() { return _ptr.id; }
 
   void set id(String value) { _ptr.id = value; }