Make AudioOutputDevice restartable and reinitializable

content/renderer/media/audio_device_factory.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_device_factory.h"
 
 #include "base/logging.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "media/audio/audio_input_device.h"
 #include "media/audio/audio_output_device.h"
 #include "url/origin.h"
 
+#include "base/debug/stack_trace.h"
+
 namespace content {
 
 // static
 AudioDeviceFactory* AudioDeviceFactory::factory_ = NULL;
 
 // static
 scoped_refptr<media::AudioOutputDevice> AudioDeviceFactory::NewOutputDevice(
     int render_frame_id,
     int session_id,
     const std::string& device_id,
     const url::Origin& security_origin) {
+//  base::debug::StackTrace st;
+//  st.Print();
+
   if (factory_) {
     media::AudioOutputDevice* const device = factory_->CreateOutputDevice(
         render_frame_id, session_id, device_id, security_origin);
     if (device)
       return device;
   }
 
   AudioMessageFilter* const filter = AudioMessageFilter::Get();
   scoped_refptr<media::AudioOutputDevice> device = new media::AudioOutputDevice(
       filter->CreateAudioOutputIPC(render_frame_id), filter->io_task_runner(),
@@ skipping 20 matching lines @@
 AudioDeviceFactory::AudioDeviceFactory() {
   DCHECK(!factory_) << "Can't register two factories at once.";
   factory_ = this;
 }
 
 AudioDeviceFactory::~AudioDeviceFactory() {
   factory_ = NULL;
 }
 
 }  // namespace content