Add ToString method to AggregatedStats and log stats at the end of a call.

webrtc/video/stats_counter.h

 /*
  *  Copyright (c) 2016 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_VIDEO_STATS_COUNTER_H_
 #define WEBRTC_VIDEO_STATS_COUNTER_H_
 
 #include <memory>
+#include <string>
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class AggregatedCounter;
 class Clock;
 class Samples;
 
 // |StatsCounterObserver| is called periodically when a metric is updated.
 class StatsCounterObserver {
  public:
   virtual void OnMetricUpdated(int sample) = 0;
 
   virtual ~StatsCounterObserver() {}
 };
 
 struct AggregatedStats {
+  std::string ToString() const;
+
   int64_t num_samples = 0;
   int min = -1;
   int max = -1;
   int average = -1;
   // TODO(asapersson): Consider adding median/percentiles.
 };
 
 // Classes which periodically computes a metric.
 //
 // During a period, |kProcessIntervalMs|, different metrics can be computed e.g:
@@ skipping 220 matching lines @@
  private:
   bool GetMetric(int* metric) const override;
   int GetValueForEmptyInterval() const override;  // Returns zero.
 
   RTC_DISALLOW_COPY_AND_ASSIGN(RateAccCounter);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_STATS_COUNTER_H_