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diff --git a/webrtc/modules/audio_processing/aec3/echo_remover_metrics.h b/webrtc/modules/audio_processing/aec3/echo_remover_metrics.h
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+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_AEC3_ECHO_REMOVER_METRICS_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_ECHO_REMOVER_METRICS_H_
+
+#include <array>
+
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "modules/audio_processing/aec3/aec_state.h"
+#include "rtc_base/constructor_magic.h"
+
+namespace webrtc {
+
+// Handles the reporting of metrics for the echo remover.
+class EchoRemoverMetrics {
+ public:
+  struct DbMetric {
+    DbMetric();
+    DbMetric(float sum_value, float floor_value, float ceil_value);
+    void Update(float value);
+    void UpdateInstant(float value);
+    float sum_value;
+    float floor_value;
+    float ceil_value;
+  };
+
+  EchoRemoverMetrics();
+
+  // Updates the metric with new data.
+  void Update(
+      const AecState& aec_state,
+      const std::array<float, kFftLengthBy2Plus1>& comfort_noise_spectrum,
+      const std::array<float, kFftLengthBy2Plus1>& suppressor_gain);
+
+  // Returns true if the metrics have just been reported, otherwise false.
+  bool MetricsReported() { return metrics_reported_; }
+
+ private:
+  // Resets the metrics.
+  void ResetMetrics();
+
+  int block_counter_ = 0;
+  std::array<DbMetric, 2> erl_;
+  DbMetric erl_time_domain_;
+  std::array<DbMetric, 2> erle_;
+  DbMetric erle_time_domain_;
+  int active_render_count_ = 0;
+  bool saturated_capture_ = false;
+  bool metrics_reported_ = false;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(EchoRemoverMetrics);
+};
+
+namespace aec3 {
+
+// Updates a banded metric of type DbMetric with the values in the supplied
+// array.
+void UpdateDbMetric(const std::array<float, kFftLengthBy2Plus1>& value,
+                    std::array<EchoRemoverMetrics::DbMetric, 2>* statistic);
+
+// Transforms a DbMetric from the linear domain into the logarithmic domain.
+int TransformDbMetricForReporting(bool negate,
+                                  float min_value,
+                                  float max_value,
+                                  float offset,
+                                  float scaling,
+                                  float value);
+
+}  // namespace aec3
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_ECHO_REMOVER_METRICS_H_