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

webrtc/api/audio_codecs/audio_encoder.cc

Index: webrtc/api/audio_codecs/audio_encoder.cc
diff --git a/webrtc/api/audio_codecs/audio_encoder.cc b/webrtc/api/audio_codecs/audio_encoder.cc
index 3ee371f1cee7f4b5d5390bd8c3340d7d1abd42a3..e38fe9c2e5eee1bdc683a03b4033bfe3466fa9b6 100644
--- a/webrtc/api/audio_codecs/audio_encoder.cc
+++ b/webrtc/api/audio_codecs/audio_encoder.cc
@@ -24,6 +24,11 @@ AudioEncoder::EncodedInfo& AudioEncoder::EncodedInfo::operator=(
 AudioEncoder::EncodedInfo& AudioEncoder::EncodedInfo::operator=(EncodedInfo&&) =
     default;
 
+AudioEncoder::AudioEncoderStats::AudioEncoderStats() = default;
+AudioEncoder::AudioEncoderStats::~AudioEncoderStats() = default;
+AudioEncoder::AudioEncoderStats::AudioEncoderStats(const AudioEncoderStats&) =
+    default;
+
 int AudioEncoder::RtpTimestampRateHz() const {
   return SampleRateHz();
 }
@@ -95,4 +100,8 @@ void AudioEncoder::OnReceivedOverhead(size_t overhead_bytes_per_packet) {}
 void AudioEncoder::SetReceiverFrameLengthRange(int min_frame_length_ms,
                                                int max_frame_length_ms) {}
 
+AudioEncoder::AudioEncoderStats AudioEncoder::GetStats() const {
+  return AudioEncoder::AudioEncoderStats();
+}
+
 }  // namespace webrtc