Pulling AEC divergent filter fraction.

webrtc/modules/audio_processing/include/audio_processing.h

Index: webrtc/modules/audio_processing/include/audio_processing.h
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index cded93cbfe211b87488c9e5fdc3ff1b5313eb810..5bd16e8b13528b6c0967aed57a39f964b90f3b44 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -672,6 +672,10 @@ class EchoCancellation {
 
     // (Pre non-linear processing suppression) A_NLP = 10log_10(P_echo / P_a)
     AudioProcessing::Statistic a_nlp;
+
+    // Fraction of filter being divergent, based on a 0.5-second, non-overlapped
+    // aggregation window.
+    float divergent_filter_fraction;
   };
 
   // TODO(ajm): discuss the metrics update period.