Implements NoReportedDelayOnMac Finch experiment

content/renderer/media/media_stream_audio_processor.cc

Index: content/renderer/media/media_stream_audio_processor.cc
diff --git a/content/renderer/media/media_stream_audio_processor.cc b/content/renderer/media/media_stream_audio_processor.cc
index 76ce92c76d3b9f44122f0bec0c4cce8475c6d014..915b4d30753f88b8040c0fbf49ee551bf6a7772c 100644
--- a/content/renderer/media/media_stream_audio_processor.cc
+++ b/content/renderer/media/media_stream_audio_processor.cc
@@ -6,6 +6,9 @@
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
+#if defined(OS_MACOSX)
+#include "base/metrics/field_trial.h"
+#endif
 #include "base/metrics/histogram.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream_audio_processor_options.h"
@@ -414,6 +417,10 @@ void MediaStreamAudioProcessor::InitializeAudioProcessingModule(
     config.Set<webrtc::DelayCorrection>(new webrtc::DelayCorrection(true));
   if (goog_experimental_ns)
     config.Set<webrtc::ExperimentalNs>(new webrtc::ExperimentalNs(true));
+#if defined(OS_MACOSX)
+  if (base::FieldTrialList::FindFullName("NoReportedDelayOnMac") == "Enabled")
+    config.Set<webrtc::ReportedDelay>(new webrtc::ReportedDelay(false));
+#endif
 
   // Create and configure the webrtc::AudioProcessing.
   audio_processing_.reset(webrtc::AudioProcessing::Create(config));