Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGTextPathElement.dart

Index: lib/html/doc/interface/SVGTextPathElement.dart
diff --git a/lib/html/doc/interface/SVGTextPathElement.dart b/lib/html/doc/interface/SVGTextPathElement.dart
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+// Copyright (c) 2012, 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.
+
+// WARNING: Do not edit - generated code.
+
+/// @domName SVGTextPathElement
+interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
+
+  static final int TEXTPATH_METHODTYPE_ALIGN = 1;
+
+  static final int TEXTPATH_METHODTYPE_STRETCH = 2;
+
+  static final int TEXTPATH_METHODTYPE_UNKNOWN = 0;
+
+  static final int TEXTPATH_SPACINGTYPE_AUTO = 1;
+
+  static final int TEXTPATH_SPACINGTYPE_EXACT = 2;
+
+  static final int TEXTPATH_SPACINGTYPE_UNKNOWN = 0;
+
+  /** @domName SVGTextPathElement.method */
+  final SVGAnimatedEnumeration method;
+
+  /** @domName SVGTextPathElement.spacing */
+  final SVGAnimatedEnumeration spacing;
+
+  /** @domName SVGTextPathElement.startOffset */
+  final SVGAnimatedLength startOffset;
+}