Revert of MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/media_stream_audio_track_sink.h

Index: content/renderer/media/media_stream_audio_track_sink.h
diff --git a/content/renderer/media/media_stream_audio_track_sink.h b/content/renderer/media/media_stream_audio_track_sink.h
new file mode 100644
index 0000000000000000000000000000000000000000..778c93c3fe5e9ce7460fa20279120066ba4f8706
--- /dev/null
+++ b/content/renderer/media/media_stream_audio_track_sink.h
@@ -0,0 +1,61 @@
+// Copyright 2013 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 CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_TRACK_SINK_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_TRACK_SINK_H_
+
+#include <vector>
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "media/base/audio_parameters.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+
+namespace media {
+class AudioBus;
+}
+
+namespace content {
+
+class MediaStreamAudioSink;
+
+// Interface for reference counted holder of audio stream audio track sink.
+class MediaStreamAudioTrackSink
+    : public base::RefCountedThreadSafe<MediaStreamAudioTrackSink> {
+ public:
+  // Note: OnData() and OnSetFormat() have the same meaning and semantics as in
+  // content::MediaStreamAudioSink.  See comments there for usage info.
+  virtual void OnData(const media::AudioBus& audio_bus,
+                      base::TimeTicks estimated_capture_time) = 0;
+  virtual void OnSetFormat(const media::AudioParameters& params) = 0;
+
+  virtual void OnReadyStateChanged(
+      blink::WebMediaStreamSource::ReadyState state) = 0;
+
+  virtual void Reset() = 0;
+
+  virtual bool IsEqual(const MediaStreamAudioSink* other) const = 0;
+
+  // Wrapper which allows to use std::find_if() when adding and removing
+  // sinks to/from the list.
+  struct WrapsMediaStreamSink {
+    WrapsMediaStreamSink(MediaStreamAudioSink* sink) : sink_(sink) {}
+    bool operator()(
+        const scoped_refptr<MediaStreamAudioTrackSink>& owner) const {
+      return owner->IsEqual(sink_);
+    }
+    MediaStreamAudioSink* sink_;
+  };
+
+ protected:
+  virtual ~MediaStreamAudioTrackSink() {}
+
+ private:
+  friend class base::RefCountedThreadSafe<MediaStreamAudioTrackSink>;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_TRACK_SINK_H_