Add UMA stats for AEC filter divergence metric.

content/renderer/media/media_stream_audio_processor_options.h

Index: content/renderer/media/media_stream_audio_processor_options.h
diff --git a/content/renderer/media/media_stream_audio_processor_options.h b/content/renderer/media/media_stream_audio_processor_options.h
index 2d5af1d4f41261f97fba8ace5a9072c6677499cc..de41ae34aa26716368e9f7725d05b880d6081d3b 100644
--- a/content/renderer/media/media_stream_audio_processor_options.h
+++ b/content/renderer/media/media_stream_audio_processor_options.h
@@ -103,14 +103,31 @@ class CONTENT_EXPORT EchoInformation {
   EchoInformation();
   virtual ~EchoInformation();
 
+  // Updates stats. Must be called every time AudioProcessing::ProcessStream()
+  // is called.
   void UpdateAecDelayStats(webrtc::EchoCancellation* echo_cancellation);
+  void UpdateAecDivergentFilterStats(

[tommi (sloooow) - chröme, 2016/06/28 11:43:56]

Do we need two methods? 

[Henrik Grunell, 2016/06/29 08:47:58]

No, done. Kept them internally.

+      webrtc::EchoCancellation* echo_cancellation);
+
+  // Reports AEC divergent filter stats and resets the associated data.
+  void ReportAndResetAecDivergentFilterStats();
 
  private:
-  // Counter to track 5 seconds of processed 10 ms chunks in order to query a
-  // new metric from webrtc::EchoCancellation::GetEchoDelayMetrics().
-  int num_chunks_;
+  // Counter to track 5 seconds of data in order to query a new metric from
+  // webrtc::EchoCancellation::GetEchoDelayMetrics().
+  int delay_stats_time_ms_;
   bool echo_frames_received_;
 
+  // Counter to track 1 second of data in order to query a new divergent filter
+  // fraction metric from webrtc::EchoCancellation::GetMetrics().
+  int divergent_filter_stats_time_ms_;
+
+  // Total number of times we queried for the divergent filter fraction metric.
+  int num_divergent_filter_fraction_;
+
+  // Number of non-zero divergent filter fraction metrics.
+  int num_non_zero_divergent_filter_fraction_;
+
   DISALLOW_COPY_AND_ASSIGN(EchoInformation);
 };