Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/fake_audio_output_stream.h

Index: media/audio/fake_audio_output_stream.h
diff --git a/media/audio/fake_audio_output_stream.h b/media/audio/fake_audio_output_stream.h
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0cab08289dec3bfb2f34383051366505d99ba1bd 100644
--- a/media/audio/fake_audio_output_stream.h
+++ b/media/audio/fake_audio_output_stream.h
@@ -0,0 +1,50 @@
+// Copyright (c) 2009 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.
+//
+// A fake implementation of AudioOutputStream. It is used for testing purpose.
+// TODO(hclam): Implement a thread in this fake output stream to simulate an
+// audio output stream reading from AudioSourceCallback.
+
+#ifndef MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_
+#define MEDIA_AUDIO_FAKE_AUDIO_OUTOUT_STREAM_H_
+
+#include <vector>
+
+#include "base/scoped_ptr.h"
+#include "media/audio/audio_output.h"
+
+class FakeAudioOutputStream : public AudioOutputStream {
+ public:
+  static AudioOutputStream* MakeFakeStream();
+  static FakeAudioOutputStream* GetLastFakeStream();
+
+  virtual bool Open(size_t packet_size);
+  virtual void Start(AudioSourceCallback* callback);
+  virtual void Stop();
+  virtual void SetVolume(double left_level, double right_level);
+  virtual void GetVolume(double* left_level, double* right_level);
+  virtual void Close();
+
+  char* buffer() { return buffer_.get(); }
+  double left_volume() { return left_volume_; }
+  double right_volume() { return right_volume_; }
+
+ private:
+  FakeAudioOutputStream();
+  virtual ~FakeAudioOutputStream() {}
+
+  static void DestroyLastFakeStream(void* param);
+  static bool has_created_fake_stream_;
+  static FakeAudioOutputStream* last_fake_stream_;
+
+  double left_volume_;
+  double right_volume_;
+  AudioSourceCallback* callback_;
+  scoped_array<char> buffer_;
+  size_t packet_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeAudioOutputStream);
+};
+
+#endif  // MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_