Support needed to measure user and service traffic in Chrome.

components/data_use_measurement/core/data_use_user_data.cc

Index: components/data_use_measurement/core/data_use_user_data.cc
diff --git a/components/data_use_measurement/core/data_use_user_data.cc b/components/data_use_measurement/core/data_use_user_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a29977291012deb3e7dff7e7d43e755e9c4bcd7e
--- /dev/null
+++ b/components/data_use_measurement/core/data_use_user_data.cc
@@ -0,0 +1,48 @@
+// 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.
+
+#include "components/data_use_measurement/core/data_use_user_data.h"
+
+#include "net/url_request/url_fetcher.h"
+
+namespace data_use_measurement {
+
+DataUseUserData::DataUseUserData(ServiceType service_type)
+    : service_type_(service_type) {}
+
+DataUseUserData::~DataUseUserData() {}
+
+// static
+const void* DataUseUserData::kUserDataKey =
+    static_cast<const void*>(&DataUseUserData::kUserDataKey);
+
+// static
+base::SupportsUserData::Data* DataUseUserData::CreateDataUseUserData(
+    ServiceType service_type) {
+  return new DataUseUserData(service_type);
+}
+
+// static
+const char* DataUseUserData::GetServiceName(
+    DataUseUserData::ServiceType service_type) {
+  switch (service_type) {
+    case SUGGESTIONS:
+      return "Suggestions";
+    case NOT_TAGGED:
+      return "NotTagged";
+    default:

[Alexei Svitkine (slow), 2015/09/02 18:11:20]

Remove the default case and put the NOTREACHED() outside the switch below.

This way, compilers will warn when you expand the enum without updating the
switch.

[amohammadkhan, 2015/09/03 04:31:19]

Done.

+      NOTREACHED() << "Unknown service type in DataUseUserData";
+  }
+  return "INVALID";
+}
+
+// static
+void DataUseUserData::AttachDataUserUserDataToFetcher(
+    net::URLFetcher* fetcher,
+    ServiceType service_type) {
+  fetcher->SetURLRequestUserData(
+      kUserDataKey, base::Bind(&CreateDataUseUserData, service_type));
+}
+
+}  // namespace data_use_measurement