Move AudioDebugFileWriter from content/ to media/.

media/audio/audio_file_writer.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_FILE_WRITER_H_
-#define MEDIA_AUDIO_AUDIO_FILE_WRITER_H_
-
-#include <memory>
-
-namespace base {
-class FilePath;
-}
-
-namespace media {
-
-class AudioBus;
-
-// A writer interface used for writing audio data to file for debugging
-// purposes.
-class AudioFileWriter {
- public:
-  virtual ~AudioFileWriter() {}
-
-  // Must be called before calling Write() for the first time after creation or
-  // Stop() call. Can be called on any sequence; Write() and Stop() must be
-  // called on the same sequence as Start().
-  virtual void Start(const base::FilePath& file) = 0;
-
-  // Must be called to finish recording. Each call to Start() requires a call to
-  // Stop(). Will be automatically called on destruction.
-  virtual void Stop() = 0;
-
-  // Write |data| to file.
-  virtual void Write(std::unique_ptr<AudioBus> data) = 0;
-
-  // Returns true if Write() call scheduled at this point will most likely write
-  // data to the file, and false if it most likely will be a no-op. The result
-  // may be ambigulous if Start() or Stop() is executed at the moment. Can be
-  // called from any sequence.
-  virtual bool WillWrite() = 0;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_AUDIO_FILE_WRITER_H_