Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGStyleElement.dart

Index: lib/html/doc/interface/SVGStyleElement.dart
diff --git a/lib/html/doc/interface/SVGStyleElement.dart b/lib/html/doc/interface/SVGStyleElement.dart
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index 0000000000000000000000000000000000000000..94e969463b43227cc647c353ad8a70ccdb4b6423
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+++ b/lib/html/doc/interface/SVGStyleElement.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 SVGStyleElement
+interface SVGStyleElement extends SVGElement, SVGLangSpace {
+
+  /** @domName SVGStyleElement.disabled */
+  bool disabled;
+
+  /** @domName SVGStyleElement.media */
+  String media;
+
+  /** @domName SVGStyleElement.title */
+  String title;
+
+  /** @domName SVGStyleElement.type */
+  String type;
+}