Add dummy dart:html library for documentation.

lib/html/doc/interface/XMLHttpRequestException.dartdoc

Index: lib/html/doc/interface/XMLHttpRequestException.dartdoc
diff --git a/lib/html/doc/interface/XMLHttpRequestException.dartdoc b/lib/html/doc/interface/XMLHttpRequestException.dartdoc
new file mode 100644
index 0000000000000000000000000000000000000000..4094fc83aa8569b171f69a38b39b61a9ec803f88
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+++ b/lib/html/doc/interface/XMLHttpRequestException.dartdoc
@@ -0,0 +1,27 @@
+// 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:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName XMLHttpRequestException
+interface XMLHttpRequestException {
+
+  static final int ABORT_ERR = 102;
+
+  static final int NETWORK_ERR = 101;
+
+  /** @domName XMLHttpRequestException.code */
+  final int code;
+
+  /** @domName XMLHttpRequestException.message */
+  final String message;
+
+  /** @domName XMLHttpRequestException.name */
+  final String name;
+
+  /** @domName XMLHttpRequestException.toString */
+  String toString();
+}