Delegate PersistedLogs metrics recording

components/metrics/persisted_logs_metrics_impl.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/persisted_logs_metrics_impl.h"
+
+#include "base/metrics/histogram_macros.h"
+
+namespace metrics {
+
+PersistedLogs::LogReadStatus
+PersistedLogsMetricsImpl::RecordLogReadStatus(
+    PersistedLogs::LogReadStatus status) {
+  UMA_HISTOGRAM_ENUMERATION("PrefService.PersistentLogRecallProtobufs",
+                            status, PersistedLogs::END_RECALL_STATUS);
+  return status;
+}
+
+void PersistedLogsMetricsImpl::RecordCompressionRatio(
+    size_t compressed_size, size_t original_size) {
+  UMA_HISTOGRAM_PERCENTAGE(
+      "UMA.ProtoCompressionRatio",
+      static_cast<int>(100 * compressed_size / original_size));
+}
+
+void PersistedLogsMetricsImpl::RecordDroppedLogSize(size_t size) {
+  UMA_HISTOGRAM_COUNTS("UMA.Large Accumulated Log Not Persisted",
+                       static_cast<int>(size));
+}
+
+void PersistedLogsMetricsImpl::RecordDroppedLogsNum(int dropped_logs_num) {
+  UMA_HISTOGRAM_COUNTS("UMA.UnsentLogs.Dropped", dropped_logs_num);
+}
+
+}  // namespace metrics