Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGViewSpec.dart

+// 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 SVGViewSpec
+interface SVGViewSpec {
+
+  /** @domName SVGViewSpec.preserveAspectRatio */
+  final SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+
+  /** @domName SVGViewSpec.preserveAspectRatioString */
+  final String preserveAspectRatioString;
+
+  /** @domName SVGViewSpec.transform */
+  final SVGTransformList transform;
+
+  /** @domName SVGViewSpec.transformString */
+  final String transformString;
+
+  /** @domName SVGViewSpec.viewBox */
+  final SVGAnimatedRect viewBox;
+
+  /** @domName SVGViewSpec.viewBoxString */
+  final String viewBoxString;
+
+  /** @domName SVGViewSpec.viewTarget */
+  final SVGElement viewTarget;
+
+  /** @domName SVGViewSpec.viewTargetString */
+  final String viewTargetString;
+
+  /** @domName SVGViewSpec.zoomAndPan */
+  int zoomAndPan;
+}