Measuring data use of different ModelTypes in Sync Service.

net/url_request/data_use_measurement.cc

 // 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 <string>
 
 #include "base/hash.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "net/base/network_change_notifier.h"
@@ skipping 118 matching lines @@
   std::string serviceHistogramName = "DataUse.Service." + service_name;
   std::string combinedHistogramName =
       "DataUse.Services" + first_suffix + second_suffix + third_suffix;
   UMA_HISTOGRAM_SPARSE_SLOWLY_WITH_VALUE(
       combinedHistogramName, base::Hash(service_name), message_size);
   TRAFFIC_MEASUREMENT_UMA_HISTOGRAM(serviceHistogramName, message_size);
 }
 
 }  // namespace
 
+void SparseDataUseReport(const std::string& histogram_name,
+                         int value,
+                         int count) {
+  if (count > 0)
+    UMA_HISTOGRAM_SPARSE_SLOWLY_WITH_VALUE(histogram_name, value, count);
+}
+
 void DataUseReport(const std::string& service_name,
                    const net::URLFetcher* fetcher) {
 #if defined(OS_ANDROID)
   if (!listener_made) {
     listener_made = true;
     app_listener = new base::android::ApplicationStatusListener(
         base::Bind(&OnApplicationStateChange));
   }
 #endif
   int total_upload_bytes = fetcher->GetBytesSentSize();
   int total_received_bytes = fetcher->GetBytesReceivedSize();
   ReportDataUsage(service_name, UPLOAD, total_upload_bytes);
   ReportDataUsage(service_name, DOWNLOAD, total_received_bytes);
 }