Audio output debug recording.

media/audio/fake_audio_file_writer.cc

Index: media/audio/fake_audio_file_writer.cc
diff --git a/media/audio/fake_audio_file_writer.cc b/media/audio/fake_audio_file_writer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7cb0bc8f3008119a940bc17ecf2d7042546fdcea
--- /dev/null
+++ b/media/audio/fake_audio_file_writer.cc
@@ -0,0 +1,31 @@
+// Copyright 2017 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/fake_audio_file_writer.h"
+
+#include "base/memory/ptr_util.h"
+
+namespace media {
+
+FakeAudioFileWriter::FakeAudioFileWriter() {}
+
+FakeAudioFileWriter::~FakeAudioFileWriter() {}
+
+void FakeAudioFileWriter::Start(const base::FilePath& file_name) {}
+
+void FakeAudioFileWriter::Stop() {}
+
+void FakeAudioFileWriter::Write(std::unique_ptr<media::AudioBus> data) {}
+
+bool FakeAudioFileWriter::WillWrite() {
+  return false;
+}
+
+// static
+std::unique_ptr<media::AudioFileWriter> FakeAudioFileWriter::Create(
+    const media::AudioParameters& params) {
+  return base::MakeUnique<FakeAudioFileWriter>();
+}
+
+}  // namespace media