Network traffic annotation stored in url_request.

net/url_request/url_fetcher_factory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_URL_REQUEST_URL_FETCHER_FACTORY_H_
 #define NET_URL_REQUEST_URL_FETCHER_FACTORY_H_
 
 #include "net/url_request/url_fetcher.h"
 
 namespace net {
 class URLFetcherDelegate;
 
 // URLFetcher::Create uses the currently registered Factory to create the
 // URLFetcher. Factory is intended for testing.
 class URLFetcherFactory {
  public:
   virtual std::unique_ptr<URLFetcher> CreateURLFetcher(
       int id,
       const GURL& url,
       URLFetcher::RequestType request_type,
-      URLFetcherDelegate* delegate) = 0;
+      URLFetcherDelegate* delegate,
+      NetworkTrafficAnnotationTag traffic_annotation) = 0;
 
  protected:
   virtual ~URLFetcherFactory() {}
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_FACTORY_H_