Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGForeignObjectElement.dart

Index: lib/html/doc/interface/SVGForeignObjectElement.dart
diff --git a/lib/html/doc/interface/SVGForeignObjectElement.dart b/lib/html/doc/interface/SVGForeignObjectElement.dart
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index 0000000000000000000000000000000000000000..184d8e379dd91e556c75fe5287b493f1e9891397
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+++ b/lib/html/doc/interface/SVGForeignObjectElement.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 SVGForeignObjectElement
+interface SVGForeignObjectElement extends SVGElement, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGTransformable {
+
+  /** @domName SVGForeignObjectElement.height */
+  final SVGAnimatedLength height;
+
+  /** @domName SVGForeignObjectElement.width */
+  final SVGAnimatedLength width;
+
+  /** @domName SVGForeignObjectElement.x */
+  final SVGAnimatedLength x;
+
+  /** @domName SVGForeignObjectElement.y */
+  final SVGAnimatedLength y;
+}