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

webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h

Index: webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h b/webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h
index 6d03730a1738d6262207c084e27a54a403b62f41..28ed032ea047cfc37590d92b1b2fca5c977e44a5 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h
@@ -38,6 +38,16 @@ struct AudioEncoderRuntimeConfig {
 // encoder based on network metrics.
 class AudioNetworkAdaptor {
  public:
+  struct AudioNetworkAdaptorStats {
+    AudioNetworkAdaptorStats();
+    AudioNetworkAdaptorStats(const AudioNetworkAdaptorStats&);
+    ~AudioNetworkAdaptorStats();
+    rtc::Optional<int> ana_bitrate_action_counter;
+    rtc::Optional<int> ana_channel_action_counter;
+    rtc::Optional<int> ana_dtx_action_counter;
+    rtc::Optional<int> ana_fec_action_counter;
+    rtc::Optional<int> ana_frame_length_action_counter;
+  };
 
   virtual ~AudioNetworkAdaptor() = default;
 
@@ -60,6 +70,8 @@ class AudioNetworkAdaptor {
   virtual void StartDebugDump(FILE* file_handle) = 0;
 
   virtual void StopDebugDump() = 0;
+
+  virtual AudioNetworkAdaptorStats GetStats() const = 0;
 };
 
 }  // namespace webrtc