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

ash/system/tray/system_tray.cc

 // 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.
 
 #include "ash/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
+#include "ash/system/audio/tray_audio.h"
 #include "ash/system/bluetooth/tray_bluetooth.h"
 #include "ash/system/date/tray_date.h"
 #include "ash/system/drive/tray_drive.h"
 #include "ash/system/ime/tray_ime.h"
 #include "ash/system/monitor/tray_monitor.h"
 #include "ash/system/session_length_limit/tray_session_length_limit.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_bubble_wrapper.h"
@@ skipping 17 matching lines @@
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/view.h"
 
 #if defined(OS_CHROMEOS)
-#include "ash/system/chromeos/audio/tray_audio.h"
+#include "ash/system/chromeos/audio/tray_audio_chromeos.h"
+#include "ash/system/chromeos/audio/tray_audio_delegate_chromeos.h"
 #include "ash/system/chromeos/brightness/tray_brightness.h"
 #include "ash/system/chromeos/enterprise/tray_enterprise.h"
 #include "ash/system/chromeos/managed/tray_locally_managed_user.h"
 #include "ash/system/chromeos/network/tray_network.h"
 #include "ash/system/chromeos/network/tray_sms.h"
 #include "ash/system/chromeos/network/tray_vpn.h"
 #include "ash/system/chromeos/power/tray_power.h"
 #include "ash/system/chromeos/screen_security/screen_capture_tray_item.h"
 #include "ash/system/chromeos/screen_security/screen_share_tray_item.h"
 #include "ash/system/chromeos/settings/tray_settings.h"
@@ skipping 127 matching lines @@
   AddTrayItem(
       new internal::TrayPower(this, message_center::MessageCenter::Get()));
   AddTrayItem(new internal::TrayNetwork(this));
   AddTrayItem(new internal::TrayVPN(this));
   AddTrayItem(new internal::TraySms(this));
   AddTrayItem(new internal::TrayBluetooth(this));
   AddTrayItem(new internal::TrayDrive(this));
   AddTrayItem(new internal::TrayDisplay(this));
   AddTrayItem(new internal::ScreenCaptureTrayItem(this));
   AddTrayItem(new internal::ScreenShareTrayItem(this));
-  AddTrayItem(new internal::TrayAudio(this));
+  AddTrayItem(
+      new internal::TrayAudioChromeOs(this,
+                                      new system::TrayAudioDelegateChromeOs()));
   AddTrayItem(new internal::TrayBrightness(this));
   AddTrayItem(new internal::TrayCapsLock(this));
   AddTrayItem(new internal::TraySettings(this));
   AddTrayItem(new internal::TrayUpdate(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new internal::TrayUpdate(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_LINUX)
@@ skipping 518 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash