Implement UMA log throttling for cellular connections

components/metrics/metrics_data_use_measurements.h

+// Copyright 2014 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.
+
+#ifndef COMPONENTS_METRICS_METRICS_DATA_USE_MEASUREMENT_H_
+#define COMPONENTS_METRICS_METRICS_DATA_USE_MEASUREMENT_H_
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/prefs/pref_service.h"
+
+namespace metrics {
+
+class MetricsDataUseMeasurements{
+public:
+  static void Initialize(PrefService* local_state);
+  static MetricsDataUseMeasurements* GetInstance();
+
+  void UpdateMetricsUsagePrefs(const std::string& service_name, int message_size);

[Alexei Svitkine (slow), 2016/03/18 22:23:30]

Suggest running "git cl format" on your CL.

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

hmm, didn't notice it didn't apply to new files

+  bool CanUploadUMALog(int log_bytes);
+
+  ~MetricsDataUseMeasurements();
+private:
+  FRIEND_TEST_ALL_PREFIXES(MetricsDataUseMeasurementsTest, CheckUpdateUsagePref);
+  FRIEND_TEST_ALL_PREFIXES(MetricsDataUseMeasurementsTest, CheckRemoveExpiredEntries);
+  FRIEND_TEST_ALL_PREFIXES(MetricsDataUseMeasurementsTest, CheckTotalDataUse);
+  FRIEND_TEST_ALL_PREFIXES(MetricsDataUseMeasurementsTest, CheckCanUploadUMALog);
+  MetricsDataUseMeasurements(PrefService* local_state);
+
+  void UpdateMetricsUsagePrefsOnUIThread(const std::string& service_name, int message_size);
+  void SetMeasurementDateForTesting(std::string date);
+  void RemoveExpiredEntries();
+  void UpdateUsagePref(const std::string& pref_name, int message_size);
+  std::string GetCurrentMeasurementDate();
+  int GetUmaQouta();
+  double GetUmaRatio();
+  int TotalDataUse(std::string pref_name);
+  void RemoveExpiredEntriesForPref(std::string pref_name);
+
+  PrefService* local_state_;
+  std::string date_for_testing_;
+  base::WeakPtrFactory<MetricsDataUseMeasurements> self_ptr_factory_;

[Alexei Svitkine (slow), 2016/03/18 22:23:30]

Nit: weak_ptr_factory_

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

Done.

+};
+
+}// namespace metrics
+#endif  // COMPONENTS_METRICS_METRICS_DATA_USE_MEASUREMENT_H_