Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGFETurbulenceElement.dart

Index: lib/html/doc/interface/SVGFETurbulenceElement.dart
diff --git a/lib/html/doc/interface/SVGFETurbulenceElement.dart b/lib/html/doc/interface/SVGFETurbulenceElement.dart
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+++ b/lib/html/doc/interface/SVGFETurbulenceElement.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 SVGFETurbulenceElement
+interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
+
+  static final int SVG_STITCHTYPE_NOSTITCH = 2;
+
+  static final int SVG_STITCHTYPE_STITCH = 1;
+
+  static final int SVG_STITCHTYPE_UNKNOWN = 0;
+
+  static final int SVG_TURBULENCE_TYPE_FRACTALNOISE = 1;
+
+  static final int SVG_TURBULENCE_TYPE_TURBULENCE = 2;
+
+  static final int SVG_TURBULENCE_TYPE_UNKNOWN = 0;
+
+  /** @domName SVGFETurbulenceElement.baseFrequencyX */
+  final SVGAnimatedNumber baseFrequencyX;
+
+  /** @domName SVGFETurbulenceElement.baseFrequencyY */
+  final SVGAnimatedNumber baseFrequencyY;
+
+  /** @domName SVGFETurbulenceElement.numOctaves */
+  final SVGAnimatedInteger numOctaves;
+
+  /** @domName SVGFETurbulenceElement.seed */
+  final SVGAnimatedNumber seed;
+
+  /** @domName SVGFETurbulenceElement.stitchTiles */
+  final SVGAnimatedEnumeration stitchTiles;
+
+  /** @domName SVGFETurbulenceElement.type */
+  final SVGAnimatedEnumeration type;
+}