Make AudioDebugFileWriter create its own file worker thread.

media/audio/audio_manager.h

 // 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.
 
 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 36 matching lines @@
   //
   // The manager will use |audio_thread->GetTaskRunner()| for audio IO.
   // On OS_MACOSX, CoreAudio requires that |audio_thread->GetTaskRunner()|
   // must belong to the main thread of the process, which in our case is sadly
   // the browser UI thread. Failure to execute calls on the right thread leads
   // to crashes and odd behavior. See http://crbug.com/158170.
   //
   // The manager will use |audio_thread->GetWorkerTaskRunner()| for heavyweight
   // tasks. The |audio_thread->GetWorkerTaskRunner()| may be the same as
   // |audio_thread->GetTaskRunner()|.
-  //
-  // |file_task_runner| is used for audio debug recordings and is the task
-  // runner to do file output operations on.
   static std::unique_ptr<AudioManager> Create(
       std::unique_ptr<AudioThread> audio_thread,
-      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
       AudioLogFactory* audio_log_factory);
 
   // A convenience wrapper of AudioManager::Create for testing.
   static std::unique_ptr<AudioManager> CreateForTesting(
       std::unique_ptr<AudioThread> audio_thread);
 
   // Starts monitoring AudioManager task runner for hangs.
   // Runs the monitor on the given |task_runner|, which must be different from
   // AudioManager::GetTaskRunner to be meaningful.
   // This must be called only after an AudioManager instance is created.
@@ skipping 121 matching lines @@
  protected:
   FRIEND_TEST_ALL_PREFIXES(AudioManagerTest, AudioDebugRecording);
   friend class AudioDeviceInfoAccessorForTests;
 
   explicit AudioManager(std::unique_ptr<AudioThread> audio_thread);
 
   virtual void ShutdownOnAudioThread() = 0;
 
   // Initializes output debug recording. Can be called on any thread; will post
   // to the audio thread if not called on it.
-  virtual void InitializeOutputDebugRecording(
-      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) = 0;
+  virtual void InitializeOutputDebugRecording() = 0;
 
   // Returns true if the OS reports existence of audio devices. This does not
   // guarantee that the existing devices support all formats and sample rates.
   virtual bool HasAudioOutputDevices() = 0;
 
   // Returns true if the OS reports existence of audio recording devices. This
   // does not guarantee that the existing devices support all formats and
   // sample rates.
   virtual bool HasAudioInputDevices() = 0;
 
@@ skipping 58 matching lines @@
   std::unique_ptr<AudioThread> audio_thread_;
   bool shutdown_ = false;  // True after |this| has been shutdown.
 
   THREAD_CHECKER(thread_checker_);
   DISALLOW_COPY_AND_ASSIGN(AudioManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_