Support 'Conditional' idl attribute.

client/dom/generated/src/interface/InjectedScriptHost.dart

-// Copyright (c) 2011, 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.
-
-interface InjectedScriptHost {
-
-  void clearConsoleMessages();
-
-  void copyText(String text);
-
-  int databaseId(Object database);
-
-  void didCreateWorker(int id, String url, bool isFakeWorker);
-
-  void didDestroyWorker(int id);
-
-  Object evaluate(String text);
-
-  Object functionDetails(Object object);
-
-  void inspect(Object objectId, Object hints);
-
-  Object inspectedNode(int num);
-
-  Object internalConstructorName(Object object);
-
-  bool isHTMLAllCollection(Object object);
-
-  int nextWorkerId();
-
-  int storageId(Object storage);
-
-  String type(Object object);
-}