Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGTests.dartdoc

Index: lib/html/doc/interface/SVGTests.dartdoc
diff --git a/lib/html/doc/interface/SVGTests.dartdoc b/lib/html/doc/interface/SVGTests.dartdoc
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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:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @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);
+}