Add dummy dart:html library for documentation.

lib/html/doc/interface/IDBDatabaseException.dartdoc

+// 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 IDBDatabaseException
+interface IDBDatabaseException {
+
+  static final int ABORT_ERR = 20;
+
+  static final int CONSTRAINT_ERR = 4;
+
+  static final int DATA_ERR = 5;
+
+  static final int NON_TRANSIENT_ERR = 2;
+
+  static final int NOT_ALLOWED_ERR = 6;
+
+  static final int NOT_FOUND_ERR = 8;
+
+  static final int NO_ERR = 0;
+
+  static final int QUOTA_ERR = 22;
+
+  static final int READ_ONLY_ERR = 9;
+
+  static final int TIMEOUT_ERR = 23;
+
+  static final int TRANSACTION_INACTIVE_ERR = 7;
+
+  static final int UNKNOWN_ERR = 1;
+
+  static final int VER_ERR = 12;
+
+  /** @domName IDBDatabaseException.code */
+  final int code;
+
+  /** @domName IDBDatabaseException.message */
+  final String message;
+
+  /** @domName IDBDatabaseException.name */
+  final String name;
+
+  /** @domName IDBDatabaseException.toString */
+  String toString();
+}