Log audio network adapter decisions in event log.

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 a9922b0987bafc9cf04c6b8bf836384cf79f2d90..cd0734ed8c3f27f3ebadba6cd95dcc24038b2b49 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
@@ -12,9 +12,18 @@
 
 #include <utility>
 
+#include "webrtc/base/logging.h"
+
 namespace webrtc {
 
-AudioNetworkAdaptorImpl::Config::Config() = default;
+namespace {
+constexpr int kEventLogMinBitrateChangeBps = 5000;
+constexpr float kEventLogMinBitrateChangeFraction = 0.25;
+constexpr float kEventLogMinPacketLossChangeFraction = 0.5;
+}  // namespace
+
+AudioNetworkAdaptorImpl::Config::Config()
+    : event_log(nullptr), clock(nullptr){};
 
 AudioNetworkAdaptorImpl::Config::~Config() = default;
 
@@ -24,7 +33,11 @@ AudioNetworkAdaptorImpl::AudioNetworkAdaptorImpl(
     std::unique_ptr<DebugDumpWriter> debug_dump_writer)
     : config_(config),
       controller_manager_(std::move(controller_manager)),
-      debug_dump_writer_(std::move(debug_dump_writer)) {
+      debug_dump_writer_(std::move(debug_dump_writer)),
+      event_log_writer_(config.event_log,
+                        kEventLogMinBitrateChangeBps,
+                        kEventLogMinBitrateChangeFraction,
+                        kEventLogMinPacketLossChangeFraction) {
   RTC_DCHECK(controller_manager_);
 }
 
@@ -67,11 +80,12 @@ AudioNetworkAdaptorImpl::GetEncoderRuntimeConfig() {
        controller_manager_->GetSortedControllers(last_metrics_))
     controller->MakeDecision(last_metrics_, &config);
 
-  // TODO(minyue): Add debug dumping.
   if (debug_dump_writer_)
     debug_dump_writer_->DumpEncoderRuntimeConfig(
         config, config_.clock->TimeInMilliseconds());
 
+  event_log_writer_.MayLogEncoderConfig(config);
+
   return config;
 }