Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc

Index: webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc b/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc
index 30030d14be70a3957b8c702e91a4c732effcc536..d03bd39f8df143e344cfb4277ac792539a771d7b 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.cc
@@ -23,19 +23,25 @@ DtxController::Config::Config(bool initial_dtx_enabled,
 DtxController::DtxController(const Config& config)
     : config_(config), dtx_enabled_(config_.initial_dtx_enabled) {}
 
+DtxController::~DtxController() = default;
+
+void DtxController::UpdateNetworkMetrics(
+    const NetworkMetrics& network_metrics) {
+  if (network_metrics.uplink_bandwidth_bps)
+    uplink_bandwidth_bps_ = network_metrics.uplink_bandwidth_bps;
+}
+
 void DtxController::MakeDecision(
-    const NetworkMetrics& metrics,
     AudioNetworkAdaptor::EncoderRuntimeConfig* config) {
   // Decision on |enable_dtx| should not have been made.
   RTC_DCHECK(!config->enable_dtx);
 
-  if (metrics.uplink_bandwidth_bps) {
+  if (uplink_bandwidth_bps_) {
     if (dtx_enabled_ &&
-        *metrics.uplink_bandwidth_bps >= config_.dtx_disabling_bandwidth_bps) {
+        *uplink_bandwidth_bps_ >= config_.dtx_disabling_bandwidth_bps) {
       dtx_enabled_ = false;
     } else if (!dtx_enabled_ &&
-               *metrics.uplink_bandwidth_bps <=
-                   config_.dtx_enabling_bandwidth_bps) {
+               *uplink_bandwidth_bps_ <= config_.dtx_enabling_bandwidth_bps) {
       dtx_enabled_ = true;
     }
   }