Log audio network adapter decisions in event log.

webrtc/modules/audio_coding/BUILD.gn

Index: webrtc/modules/audio_coding/BUILD.gn
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index efbf7e051b60c8be826afa53a4fe2980e2e4749a..c7e091a35ba0d36c204e512353649c0d62908354 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -849,6 +849,8 @@ rtc_static_library("audio_network_adaptor") {
     "audio_network_adaptor/debug_dump_writer.h",
     "audio_network_adaptor/dtx_controller.cc",
     "audio_network_adaptor/dtx_controller.h",
+    "audio_network_adaptor/event_log_writer.cc",
+    "audio_network_adaptor/event_log_writer.h",
     "audio_network_adaptor/fec_controller.cc",
     "audio_network_adaptor/fec_controller.h",
     "audio_network_adaptor/frame_length_controller.cc",
@@ -858,6 +860,7 @@ rtc_static_library("audio_network_adaptor") {
 
   deps = [
     "../..:webrtc_common",
+    "../../logging:rtc_event_log_api",
     "../../system_wrappers",
   ]
 
@@ -868,6 +871,11 @@ rtc_static_library("audio_network_adaptor") {
     ]
     defines = [ "WEBRTC_AUDIO_NETWORK_ADAPTOR_DEBUG_DUMP" ]
   }
+
+  if (!build_with_chromium && is_clang) {
+    # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
+    suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
+  }
 }
 
 config("neteq_config") {