UMA stats for browser/renderer audio rendering buffer size mismatch.

content/renderer/media/track_audio_renderer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/track_audio_renderer.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
@@ skipping 300 matching lines @@
   media::AudioParameters sink_params(
       hardware_params.format(), source_params_.channel_layout(),
       source_params_.sample_rate(), source_params_.bits_per_sample(),
       media::AudioLatency::GetRtcBufferSize(
           source_params_.sample_rate(), hardware_params.frames_per_buffer()));
   DVLOG(1) << ("TrackAudioRenderer::MaybeStartSink() -- Starting sink.  "
                "source_params_={")
            << source_params_.AsHumanReadableString() << "}, hardware_params_={"
            << hardware_params.AsHumanReadableString() << "}, sink parameters={"
            << sink_params.AsHumanReadableString() << '}';
+
+  // Specify the latency info to be passed to the browser side.
+  sink_params.set_latency_tag(AudioDeviceFactory::GetSourceLatencyType(
+      AudioDeviceFactory::kSourceNonRtcAudioTrack));
+
   sink_->Initialize(sink_params, this);
   sink_->Start();
   sink_->SetVolume(volume_);
   sink_->Play();  // Not all the sinks play on start.
   sink_started_ = true;
   if (IsLocalRenderer()) {
     UMA_HISTOGRAM_ENUMERATION("Media.LocalRendererSinkStates", kSinkStarted,
                               kSinkStatesMax);
   }
 }
@@ skipping 50 matching lines @@
   if (source_params_.IsValid()) {
     prior_elapsed_render_time_ =
         ComputeTotalElapsedRenderTime(prior_elapsed_render_time_,
                                       num_samples_rendered_,
                                       source_params_.sample_rate());
     num_samples_rendered_ = 0;
   }
 }
 
 }  // namespace content