Add NetEq delay plotting to event_log_visualizer

This CL adds the capability to analyze and plot how NetEq behaves in
response to a network trace.

BUG=webrtc:7467

Review-Url: https://codereview.webrtc.org/2876423002
Cr-Commit-Position: refs/heads/master@{#18590}
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index b2839be..dc107b6 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -1160,6 +1160,8 @@
     "neteq/tools/fake_decode_from_file.h",
     "neteq/tools/input_audio_file.cc",
     "neteq/tools/input_audio_file.h",
+    "neteq/tools/neteq_delay_analyzer.cc",
+    "neteq/tools/neteq_delay_analyzer.h",
     "neteq/tools/neteq_replacement_input.cc",
     "neteq/tools/neteq_replacement_input.h",
     "neteq/tools/resample_input_audio_file.cc",