Support needed to measure user and service traffic in Chrome.

chrome/browser/net/data_use_user_data.h

+// Copyright (c) 2015 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 CHROME_BROWSER_NET_DATA_USE_USER_DATA_H_
+#define CHROME_BROWSER_NET_DATA_USE_USER_DATA_H_
+
+#include <string>
+
+#include "base/supports_user_data.h"
+
+// Used to annotate URLRequests with the service name if the URLRequest is used
+// by a service.
+class DataUseUserData : public base::SupportsUserData::Data {
+ public:
+  explicit DataUseUserData(std::string service_name);
+  ~DataUseUserData() override;
+
+  std::string service_name() const { return service_name_; }
+
+  static const void* kUserDataKey;
+
+ private:
+  std::string service_name_;
+};
+
+base::SupportsUserData::Data* CreateDataUseUserData(std::string service_name);
+#endif  // CHROME_BROWSER_NET_DATA_USE_USER_DATA_H_