Adding metrics to AEC3

webrtc/modules/audio_processing/aec3/render_delay_controller_metrics.h

Index: webrtc/modules/audio_processing/aec3/render_delay_controller_metrics.h
diff --git a/webrtc/modules/audio_processing/aec3/render_delay_controller_metrics.h b/webrtc/modules/audio_processing/aec3/render_delay_controller_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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_DELAY_CONTROLLER_METRICS_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_DELAY_CONTROLLER_METRICS_H_
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/optional.h"
+
+namespace webrtc {
+
+// Handles the reporting of metrics for the render delay controller.
+class RenderDelayControllerMetrics {
+ public:
+  RenderDelayControllerMetrics() = default;
+
+  // Updates the metric with new data.
+  void Update(rtc::Optional<size_t> delay_samples, size_t buffer_delay_blocks);
+
+  // Returns true if the metrics have just been reported, otherwise false.
+  bool MetricsReported() { return metrics_reported_; }
+
+ private:
+  // Resets the metrics.
+  void ResetMetrics();
+
+  size_t delay_blocks_ = 0;
+  int reliable_delay_estimate_counter_ = 0;
+  int delay_change_counter_ = 0;
+  int call_counter_ = 0;
+  int initial_call_counter_ = 0;
+  bool metrics_reported_ = false;
+  bool initial_update = true;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(RenderDelayControllerMetrics);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_DELAY_CONTROLLER_METRICS_H_