Delegate PersistedLogs metrics recording

components/metrics/persisted_logs_metrics_impl.h

+// 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.
+
+#ifndef COMPONENTS_METRICS_PERSISTED_LOGS_METRICS_IMPL_H_
+#define COMPONENTS_METRICS_PERSISTED_LOGS_METRICS_IMPL_H_
+
+#include "base/macros.h"
+#include "components/metrics/persisted_logs_metrics.h"
+
+namespace metrics {
+
+// Implementation for recording metrics from PersistedLogs.
+class PersistedLogsMetricsImpl : public PersistedLogsMetrics {
+ public:
+  PersistedLogsMetricsImpl() {}
+  ~PersistedLogsMetricsImpl() {}
+
+  PersistedLogs::LogReadStatus RecordLogReadStatus(
+      PersistedLogs::LogReadStatus status) override;
+
+  void RecordCompressionRatio(
+    size_t compressed_size, size_t original_size) override;
+
+  void RecordDroppedLogSize(size_t size) override;
+
+  void RecordDroppedLogsNum(int dropped_logs_num) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PersistedLogsMetricsImpl);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_PERSISTED_LOGS_METRICS_IMPL_H_