Create Ukm ReportingService implementation.

components/metrics/data_use_tracker.cc

 // Copyright 2016 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/metrics/data_use_tracker.h"
 
 #include <string>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 36 matching lines @@
 
 void DataUseTracker::UpdateMetricsUsagePrefs(const std::string& service_name,
                                              int message_size,
                                              bool is_cellular) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (!is_cellular)
     return;
 
   UpdateUsagePref(prefs::kUserCellDataUse, message_size);
-  if (service_name == "UMA")
+  // TODO(holte): Consider adding seperate tracking for UKM.
+  if (service_name == "UMA" || service_name == "UKM")
     UpdateUsagePref(prefs::kUmaCellDataUse, message_size);
 }
 
 bool DataUseTracker::ShouldUploadLogOnCellular(int log_bytes) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   RemoveExpiredEntries();
 
   int uma_weekly_quota_bytes;
   if (!GetUmaWeeklyQuota(&uma_weekly_quota_bytes))
@@ skipping 107 matching lines @@
 std::string DataUseTracker::GetCurrentMeasurementDateAsString() const {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   base::Time::Exploded today_exploded;
   GetCurrentMeasurementDate().LocalExplode(&today_exploded);
   return base::StringPrintf("%04d-%02d-%02d", today_exploded.year,
                             today_exploded.month, today_exploded.day_of_month);
 }
 
 }  // namespace metrics