Audio input traces for Mac (browser-side)

media/audio/audio_input_controller.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 "media/audio/audio_input_controller.h"
 
 #include <algorithm>
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
 #include "media/audio/audio_input_writer.h"
 #include "media/base/user_input_monitor.h"
 
 namespace {
 
 const int kMaxInputChannels = 3;
 
 #if defined(AUDIO_POWER_MONITORING)
 // Time in seconds between two successive measurements of audio power levels.
 const int kPowerMonitorLogIntervalSeconds = 15;
@@ skipping 383 matching lines @@
   }
 
   // Set the stream volume and scale to a range matched to the platform.
   stream_->SetVolume(max_volume_ * volume);
 }
 
 void AudioInputController::OnData(AudioInputStream* stream,
                                   const AudioBus* source,
                                   uint32_t hardware_delay_bytes,
                                   double volume) {
+  TRACE_EVENT0("audio", "AudioInputController::OnData");
   if (debug_writer_ && debug_writer_->WillWrite()) {
     std::unique_ptr<AudioBus> source_copy =
         AudioBus::Create(source->channels(), source->frames());
     source->CopyTo(source_copy.get());
     task_runner_->PostTask(
         FROM_HERE,
         base::Bind(
             &AudioInputController::WriteInputDataForDebugging,
             this,
             base::Passed(&source_copy)));
@@ skipping 205 matching lines @@
   if (debug_writer_)
     debug_writer_->Write(std::move(data));
 }
 
 void AudioInputController::LogMessage(const std::string& message) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   handler_->OnLog(this, message);
 }
 
 }  // namespace media