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..b488559585f5ef6dac8f4781ebc65b421974bb54 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
@@ -11,6 +11,7 @@
 #ifndef WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_INCLUDE_AUDIO_NETWORK_ADAPTOR_H_
 #define WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_INCLUDE_AUDIO_NETWORK_ADAPTOR_H_
 
+#include "webrtc/common_types.h"
 #include "webrtc/rtc_base/optional.h"
 
 namespace webrtc {
@@ -38,7 +39,6 @@ struct AudioEncoderRuntimeConfig {
 // encoder based on network metrics.
 class AudioNetworkAdaptor {
  public:
-
   virtual ~AudioNetworkAdaptor() = default;
 
   virtual void SetUplinkBandwidth(int uplink_bandwidth_bps) = 0;
@@ -60,6 +60,8 @@ class AudioNetworkAdaptor {
   virtual void StartDebugDump(FILE* file_handle) = 0;
 
   virtual void StopDebugDump() = 0;
+
+  virtual ANAStats GetStats() const = 0;
 };
 
 }  // namespace webrtc