Add dummy dart:html library for documentation.

lib/html/doc/interface/NodeFilter.dart

Index: lib/html/doc/interface/NodeFilter.dart
diff --git a/lib/html/doc/interface/NodeFilter.dart b/lib/html/doc/interface/NodeFilter.dart
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+++ b/lib/html/doc/interface/NodeFilter.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 NodeFilter
+interface NodeFilter {
+
+  static final int FILTER_ACCEPT = 1;
+
+  static final int FILTER_REJECT = 2;
+
+  static final int FILTER_SKIP = 3;
+
+  static final int SHOW_ALL = 0xFFFFFFFF;
+
+  static final int SHOW_ATTRIBUTE = 0x00000002;
+
+  static final int SHOW_CDATA_SECTION = 0x00000008;
+
+  static final int SHOW_COMMENT = 0x00000080;
+
+  static final int SHOW_DOCUMENT = 0x00000100;
+
+  static final int SHOW_DOCUMENT_FRAGMENT = 0x00000400;
+
+  static final int SHOW_DOCUMENT_TYPE = 0x00000200;
+
+  static final int SHOW_ELEMENT = 0x00000001;
+
+  static final int SHOW_ENTITY = 0x00000020;
+
+  static final int SHOW_ENTITY_REFERENCE = 0x00000010;
+
+  static final int SHOW_NOTATION = 0x00000800;
+
+  static final int SHOW_PROCESSING_INSTRUCTION = 0x00000040;
+
+  static final int SHOW_TEXT = 0x00000004;
+
+  /** @domName NodeFilter.acceptNode */
+  int acceptNode(Node n);
+}