Allow content embedders to create AudioManager.

media/audio/audio_manager_factory.h

-// Copyright 2015 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_FACTORY_H_
-#define MEDIA_AUDIO_AUDIO_MANAGER_FACTORY_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "media/base/media_export.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
-
-namespace media {
-
-class AudioManager;
-class AudioManagerDeleter;
-class AudioLogFactory;
-
-// Allows a platform-specific implementation of AudioManager to be provided in
-// place of the default implementation at run-time.
-class MEDIA_EXPORT AudioManagerFactory {
- public:
-  virtual ~AudioManagerFactory() {}
-
-  // Creates an instance of AudioManager implementation. Caller owns the
-  // returned instance. |audio_log_factory| must outlive the returned instance.
-  virtual scoped_ptr<AudioManager, AudioManagerDeleter> CreateInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-      AudioLogFactory* audio_log_factory) = 0;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_AUDIO_MANAGER_FACTORY_H_