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

content/renderer/media/audio_renderer_mixer_manager.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/audio_renderer_mixer_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 54 matching lines @@
     case media::AudioLatency::LATENCY_EXACT_MS:
     // TODO(olka): add support when WebAudio requires it.
     default:
       NOTREACHED();
   }
 
   DCHECK_NE(output_buffer_size, 0);
 
   // Force to 16-bit output for now since we know that works everywhere;
   // ChromeOS does not support other bit depths.
-  return media::AudioParameters(input_params.format(),
+  media::AudioParameters params(input_params.format(),
                                 input_params.channel_layout(),
                                 output_sample_rate, 16, output_buffer_size);
+
+  // Specify the latency info to be passed to the browser side.
+  params.set_latency_tag(latency);
+  return params;
 }
 
 void LogMixerUmaHistogram(media::AudioLatency::LatencyType latency, int value) {
   switch (latency) {
     case media::AudioLatency::LATENCY_EXACT_MS:
       UMA_HISTOGRAM_CUSTOM_COUNTS(
           "Media.Audio.Render.AudioInputsPerMixer.LatencyExact", value, 1, 20,
           21);
       return;
     case media::AudioLatency::LATENCY_INTERACTIVE:
@@ skipping 155 matching lines @@
     const url::Origin& security_origin)
     : source_render_frame_id(source_render_frame_id),
       params(params),
       latency(latency),
       device_id(device_id),
       security_origin(security_origin) {}
 
 AudioRendererMixerManager::MixerKey::MixerKey(const MixerKey& other) = default;
 
 }  // namespace content