Fix data usage tracking for domain reliability service

components/data_use_measurement/core/data_use_measurement.cc

Index: components/data_use_measurement/core/data_use_measurement.cc
diff --git a/components/data_use_measurement/core/data_use_measurement.cc b/components/data_use_measurement/core/data_use_measurement.cc
index 5ded37e7fe909e0d0e6929b772d9cec655a7afa9..b0ff81ddce705482693c492276114b1e4488c224 100644
--- a/components/data_use_measurement/core/data_use_measurement.cc
+++ b/components/data_use_measurement/core/data_use_measurement.cc
@@ -10,6 +10,7 @@
 #include "build/build_config.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/data_use_measurement/core/url_request_classifier.h"
+#include "components/domain_reliability/uploader.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/upload_data_stream.h"
 #include "net/http/http_response_headers.h"
@@ -92,6 +93,14 @@ void DataUseMeasurement::OnBeforeURLRequest(net::URLRequest* request) {
     data_use_user_data = new DataUseUserData(
         DataUseUserData::ServiceName::NOT_TAGGED, CurrentAppState());
     request->SetUserData(DataUseUserData::kUserDataKey, data_use_user_data);
+  } else if (domain_reliability::DomainReliabilityUploader::

[RyanSturm, 2016/12/01 01:45:20]

If domain_reliability isn't adding DataUseUserData::kUserDataKey, shouldn't
data_use_user_data be null, so this code path won't actually run?

+                 OriginatedFromDomainReliability(*request)) {
+    // Detect if the request originated from DomainReliability.
+    // DataUseUserData::AttachToFetcher() cannot be called from domain
+    // reliability, since it sets userdata on URLFetcher for its purposes.
+    data_use_user_data = new DataUseUserData(
+        DataUseUserData::ServiceName::DOMAIN_RELIABILITY, CurrentAppState());
+    request->SetUserData(DataUseUserData::kUserDataKey, data_use_user_data);
   }
 }