Reland of "Log audio network adapter decisions in event log."

This was originally reviewed https://codereview.webrtc.org/2559953002/

It was reverted due to a bug in the original CL, see https://codereview.webrtc.org/2631703002/

This CL is to fix and reland.

BUG=webrtc:6845

Review-Url: https://codereview.webrtc.org/2644863002
Cr-Commit-Position: refs/heads/master@{#16242}
diff --git a/webrtc/tools/event_log_visualizer/analyzer.cc b/webrtc/tools/event_log_visualizer/analyzer.cc
index 89e516a..3fd2c25 100644
--- a/webrtc/tools/event_log_visualizer/analyzer.cc
+++ b/webrtc/tools/event_log_visualizer/analyzer.cc
@@ -423,6 +423,9 @@
         bwe_loss_updates_.push_back(bwe_update);
         break;
       }
+      case ParsedRtcEventLog::AUDIO_NETWORK_ADAPTATION_EVENT: {
+        break;
+      }
       case ParsedRtcEventLog::BWE_PACKET_DELAY_EVENT: {
         break;
       }