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

content/renderer/media/renderer_webaudiodevice_impl.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/renderer_webaudiodevice_impl.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 58 matching lines @@
   // starting the audio device.  The reason for all this is because the creator
   // of the WebAudio objects might not be the actual source of the audio (e.g.,
   // an extension creates a object that is passed and used within a page).
   WebLocalFrame* const web_frame = WebLocalFrame::frameForCurrentContext();
   RenderFrame* const render_frame =
       web_frame ? RenderFrame::FromWebFrame(web_frame) : NULL;
   sink_ = AudioDeviceFactory::NewAudioRendererSink(
       AudioDeviceFactory::kSourceWebAudioInteractive,
       render_frame ? render_frame->GetRoutingID() : MSG_ROUTING_NONE,
       session_id_, std::string(), security_origin_);
-  sink_->Initialize(params_, this);
+
+  // Specify the latency info to be passed to the browser side.
+  media::AudioParameters sink_params(params_);
+  sink_params.set_latency_tag(AudioDeviceFactory::GetSourceLatencyType(
+      AudioDeviceFactory::kSourceWebAudioInteractive));
+
+  sink_->Initialize(sink_params, this);
   // TODO(miu): Remove this temporary instrumentation to root-cause a memory
   // use-after-free issue. http://crbug.com/619463
   {
     CHECK(base::AtomicRefCountIsZero(&sink_is_running_))
         << "Illegal state: sink_is_running_ should be 0.";
     base::AtomicRefCountInc(&sink_is_running_);
   }
   sink_->Start();
   sink_->Play();
   start_null_audio_sink_callback_.Reset(
@@ skipping 94 matching lines @@
       << "Race condition: stop() was called during Render() operation.";
 
   return dest->frames();
 }
 
 void RendererWebAudioDeviceImpl::OnRenderError() {
   // TODO(crogers): implement error handling.
 }
 
 }  // namespace content