Refactor the TrayAudio code so that it can be used by other platforms.

ash/system/chromeos/audio/audio_detailed_view.h

Index: ash/system/chromeos/audio/audio_detailed_view.h
diff --git a/ash/system/chromeos/audio/audio_detailed_view.h b/ash/system/chromeos/audio/audio_detailed_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..f86427fd823d2b9af32a09ae5650b51b7e2f96ea
--- /dev/null
+++ b/ash/system/chromeos/audio/audio_detailed_view.h
@@ -0,0 +1,66 @@
+// Copyright (c) 2012 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 ASH_SYSTEM_CHROMEOS_AUDIO_AUDIO_DETAILED_VIEW_H_
+#define ASH_SYSTEM_CHROMEOS_AUDIO_AUDIO_DETAILED_VIEW_H_
+
+#include "ash/system/tray/tray_details_view.h"
+#include "ash/system/tray/view_click_listener.h"
+#include "ash/system/user/login_status.h"
+#include "chromeos/audio/audio_device.h"
+
+#include "ui/gfx/font.h"
+
+namespace views {
+class View;
+}
+
+namespace ash {
+namespace internal {
+
+class HoverHighlightView;
+
+namespace tray {
+
+class AudioDetailedView : public TrayDetailsView,
+                          public ViewClickListener {
+ public:
+  AudioDetailedView(SystemTrayItem* owner, user::LoginStatus login);
+
+  virtual ~AudioDetailedView();
+
+  void Update();
+
+ private:
+  void AddScrollListInfoItem(const base::string16& text);
+
+  HoverHighlightView* AddScrollListItem(const base::string16& text,
+                                        gfx::Font::FontStyle style,
+                                        bool checked);
+
+  void CreateHeaderEntry();
+  void CreateItems();
+
+  void UpdateScrollableList();
+  void UpdateAudioDevices();
+
+  // Overridden from ViewClickListener.
+  virtual void OnViewClicked(views::View* sender) OVERRIDE;
+
+  user::LoginStatus login_;
+
+  typedef std::map<views::View*, chromeos::AudioDevice> AudioDeviceMap;
+
+  chromeos::AudioDeviceList output_devices_;
+  chromeos::AudioDeviceList input_devices_;
+  AudioDeviceMap device_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioDetailedView);
+};
+
+}  // namespace tray
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_CHROMEOS_AUDIO_AUDIO_DETAILED_VIEW_H_