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

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 117 matching lines @@
 }
 
 void AudioNetworkAdaptorImpl::StartDebugDump(FILE* file_handle) {
   debug_dump_writer_ = DebugDumpWriter::Create(file_handle);
 }
 
 void AudioNetworkAdaptorImpl::StopDebugDump() {
   debug_dump_writer_.reset(nullptr);
 }
 
+ANAStats AudioNetworkAdaptorImpl::GetStats() const {
+  // TODO(ivoc): Actually implement the stat.
+  // Tracking bug: https://crbug.com/webrtc/8127
+  return ANAStats();
+}
+
 void AudioNetworkAdaptorImpl::DumpNetworkMetrics() {
   if (debug_dump_writer_)
     debug_dump_writer_->DumpNetworkMetrics(last_metrics_, rtc::TimeMillis());
 }
 
 void AudioNetworkAdaptorImpl::UpdateNetworkMetrics(
     const Controller::NetworkMetrics& network_metrics) {
   for (auto& controller : controller_manager_->GetControllers())
     controller->UpdateNetworkMetrics(network_metrics);
 }
 
 }  // namespace webrtc