Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGTests.dart

Index: lib/html/doc/interface/SVGTests.dart
diff --git a/lib/html/doc/interface/SVGTests.dart b/lib/html/doc/interface/SVGTests.dart
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index 0000000000000000000000000000000000000000..c001fa93d497bf02d06c1d564bfdc375a4b83164
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+++ b/lib/html/doc/interface/SVGTests.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 SVGTests
+interface SVGTests {
+
+  /** @domName SVGTests.requiredExtensions */
+  final SVGStringList requiredExtensions;
+
+  /** @domName SVGTests.requiredFeatures */
+  final SVGStringList requiredFeatures;
+
+  /** @domName SVGTests.systemLanguage */
+  final SVGStringList systemLanguage;
+
+  /** @domName SVGTests.hasExtension */
+  bool hasExtension(String extension);
+}