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

webrtc/modules/audio_coding/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
index f7607c6521c2f434effb96ad1eaec1393bb2bc6d..0244882de628b704e733f93c47a4162f9f72b2a2 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -204,6 +204,8 @@ class AudioCodingModuleImpl final : public AudioCodingModule {
 
   void GetDecodingCallStatistics(AudioDecodingCallStats* stats) const override;
 
+  ANAStats GetANAStats() const override;
+
  private:
   struct InputData {
     uint32_t input_timestamp;
@@ -1273,6 +1275,14 @@ void AudioCodingModuleImpl::GetDecodingCallStatistics(
   receiver_.GetDecodingCallStatistics(call_stats);
 }
 
+ANAStats AudioCodingModuleImpl::GetANAStats() const {
+  rtc::CritScope lock(&acm_crit_sect_);
+  if (encoder_stack_)
+    return encoder_stack_->GetANAStats();
+  // If no encoder is set, return default stats.
+  return ANAStats();
+}
+
 }  // namespace
 
 AudioCodingModule::Config::Config()