Add dummy dart:html library for documentation.

lib/html/doc/interface/WebKitNamedFlow.dart

Index: lib/html/doc/interface/WebKitNamedFlow.dart
diff --git a/lib/html/doc/interface/WebKitNamedFlow.dart b/lib/html/doc/interface/WebKitNamedFlow.dart
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index 0000000000000000000000000000000000000000..93c0c285923f152a1f0973ebc7724faad527a426
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+++ b/lib/html/doc/interface/WebKitNamedFlow.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 WebKitNamedFlow
+interface WebKitNamedFlow {
+
+  /** @domName WebKitNamedFlow.contentNodes */
+  final NodeList contentNodes;
+
+  /** @domName WebKitNamedFlow.name */
+  final String name;
+
+  /** @domName WebKitNamedFlow.overset */
+  final bool overset;
+
+  /** @domName WebKitNamedFlow.getRegionsByContentNode */
+  NodeList getRegionsByContentNode(Node contentNode);
+}