Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGFEBlendElement.dart

Index: lib/html/doc/interface/SVGFEBlendElement.dart
diff --git a/lib/html/doc/interface/SVGFEBlendElement.dart b/lib/html/doc/interface/SVGFEBlendElement.dart
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+++ b/lib/html/doc/interface/SVGFEBlendElement.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 SVGFEBlendElement
+interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
+
+  static final int SVG_FEBLEND_MODE_DARKEN = 4;
+
+  static final int SVG_FEBLEND_MODE_LIGHTEN = 5;
+
+  static final int SVG_FEBLEND_MODE_MULTIPLY = 2;
+
+  static final int SVG_FEBLEND_MODE_NORMAL = 1;
+
+  static final int SVG_FEBLEND_MODE_SCREEN = 3;
+
+  static final int SVG_FEBLEND_MODE_UNKNOWN = 0;
+
+  /** @domName SVGFEBlendElement.in1 */
+  final SVGAnimatedString in1;
+
+  /** @domName SVGFEBlendElement.in2 */
+  final SVGAnimatedString in2;
+
+  /** @domName SVGFEBlendElement.mode */
+  final SVGAnimatedEnumeration mode;
+}