Implement UMA log throttling for cellular connections

components/data_use_measurement/content/data_use_measurement.cc

Index: components/data_use_measurement/content/data_use_measurement.cc
diff --git a/components/data_use_measurement/content/data_use_measurement.cc b/components/data_use_measurement/content/data_use_measurement.cc
index 23f916c6ae054c38efb296be694b623aa91cd5ab..24b55e4eaefa055f169208e6a8bce820dea433ff 100644
--- a/components/data_use_measurement/content/data_use_measurement.cc
+++ b/components/data_use_measurement/content/data_use_measurement.cc
@@ -9,6 +9,7 @@
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "content/public/browser/resource_request_info.h"
+#include "components/metrics/metrics_data_use_measurements.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/upload_data_stream.h"
 #include "net/http/http_response_headers.h"
@@ -88,14 +89,16 @@ void DataUseMeasurement::ReportDataUseUMA(
 
   DataUseUserData* attached_service_data = reinterpret_cast<DataUseUserData*>(
       request->GetUserData(DataUseUserData::kUserDataKey));
-
+  DataUseUserData::ServiceName service_name =
+      attached_service_data ? attached_service_data->service_name()
+                            : DataUseUserData::NOT_TAGGED;
   if (!is_user_traffic) {
-    DataUseUserData::ServiceName service_name =
-        attached_service_data ? attached_service_data->service_name()
-                              : DataUseUserData::NOT_TAGGED;
     ReportDataUsageServices(service_name, UPSTREAM, total_upload_bytes);
     ReportDataUsageServices(service_name, DOWNSTREAM, total_received_bytes);
   }
+  metrics::MetricsDataUseMeasurements::GetInstance()->UpdateMetricsUsagePrefs(

[Alexei Svitkine (slow), 2016/03/18 22:23:29]

We can discuss more offline, but I would prefer the dependency be passed it to
the ctor.

Looks like the DataUseMeasurement object is owned by ChromeNetworkDelegate,
which is constructed here:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/pro...

So we can probably pass in a pointer to MetricsDataUseMeasurements() to it -
that would be owned by MetricsServicesManager. We can chat more about this on
Monday. You can wait on these changes until then so we make sure we're clear on
what needs to be done here.

[gayane -on leave until 09-2017, 2016/03/29 16:06:20]

Done.

+      attached_service_data->GetServiceNameAsString(service_name),
+      total_upload_bytes + total_received_bytes);
 }
 
 #if defined(OS_ANDROID)
@@ -145,5 +148,4 @@ void DataUseMeasurement::ReportDataUsageServices(
         message_size);
   }
 }
-
 }  // namespace data_use_measurement