Support needed to measure user and service traffic in Chrome.

components/data_use_measurement/content/data_use_user_data.h

+// Copyright 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 COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_USER_DATA_H_
+#define COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_USER_DATA_H_
+
+#include "base/supports_user_data.h"
+
+namespace data_use_measurement {
+// Used to annotate URLRequests with the service name if the URLRequest is used
+// by a service.
+class DataUseUserData : public base::SupportsUserData::Data {
+ public:
+  // This enum should be synced with DataUseServices enum in histograms.xml.
+  // Please keep them synced after any updates.
+  enum ServiceType {
+    SUGGESTIONS,
+  };
+  explicit DataUseUserData(ServiceType service_type);
+  ~DataUseUserData() override;
+
+  ServiceType service_type() const { return service_type_; }
+
+  static const void* kUserDataKey;
+
+ private:
+  ServiceType service_type_;
+};
+base::SupportsUserData::Data* CreateDataUseUserData(
+    DataUseUserData::ServiceType service);
+
+const char* ReturnServiceName(DataUseUserData::ServiceType service);
+}  // data_use_measurement namespace
+#endif  // COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_USER_DATA_H_