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

webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc

Index: webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc b/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
index 7645c4a1f2cf3e2cd04c0929699936d280c8ba44..627d78a4b73c7799e93334635d217e0c73ef9eb7 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
@@ -135,6 +135,12 @@ void AudioNetworkAdaptorImpl::StopDebugDump() {
   debug_dump_writer_.reset(nullptr);
 }
 
+ANAStats AudioNetworkAdaptorImpl::GetStats() const {
+  // TODO(ivoc): Actually implement the stat.
+  // Tracking bug: https://bugs.chromium.org/p/webrtc/issues/detail?id=8127

[hbos, 2017/09/07 15:47:47]

nit: https://crbug.com/webrtc/8127 works too

[ivoc, 2017/09/07 16:14:31]

Done.

+  return ANAStats();
+}
+
 void AudioNetworkAdaptorImpl::DumpNetworkMetrics() {
   if (debug_dump_writer_)
     debug_dump_writer_->DumpNetworkMetrics(last_metrics_, rtc::TimeMillis());