Add new ANA stats to GetStats() to count the number of actions taken by each controller.

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
index 5756e2af685ee1f8c5855808828abc3925160528..e3d13bc38829817c19446b22abc173f9547fe2e9 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
@@ -773,4 +773,11 @@ void AudioEncoderOpus::MaybeUpdateUplinkBandwidth() {
   }
 }
 
+ANAStats AudioEncoderOpus::GetANAStats() const {
+  if (audio_network_adaptor_) {
+    return audio_network_adaptor_->GetStats();
+  }
+  return ANAStats();
+}
+
 }  // namespace webrtc