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

ash/system/tray/system_tray_notifier.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_notifier.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/network/network_state_notifier.h"
 #endif
 
@@ skipping 11 matching lines @@
 void SystemTrayNotifier::AddAccessibilityObserver(
     AccessibilityObserver* observer) {
   accessibility_observers_.AddObserver(observer);
 }
 
 void SystemTrayNotifier::RemoveAccessibilityObserver(
     AccessibilityObserver* observer) {
   accessibility_observers_.RemoveObserver(observer);
 }
 
+void SystemTrayNotifier::AddAudioObserver(AudioObserver* observer) {
+  audio_observers_.AddObserver(observer);
+}
+
+void SystemTrayNotifier::RemoveAudioObserver(AudioObserver* observer) {
+  audio_observers_.RemoveObserver(observer);
+}
+
 void SystemTrayNotifier::AddBluetoothObserver(BluetoothObserver* observer) {
   bluetooth_observers_.AddObserver(observer);
 }
 
 void SystemTrayNotifier::RemoveBluetoothObserver(BluetoothObserver* observer) {
   bluetooth_observers_.RemoveObserver(observer);
 }
 
 void SystemTrayNotifier::AddCapsLockObserver(CapsLockObserver* observer) {
   caps_lock_observers_.AddObserver(observer);
@@ skipping 121 matching lines @@
 #endif
 
 void SystemTrayNotifier::NotifyAccessibilityModeChanged(
     AccessibilityNotificationVisibility notify) {
   FOR_EACH_OBSERVER(
       AccessibilityObserver,
       accessibility_observers_,
       OnAccessibilityModeChanged(notify));
 }
 
+void SystemTrayNotifier::NotifyAudioOutputVolumeChanged() {
+  FOR_EACH_OBSERVER(
+      AudioObserver,
+      audio_observers_,
+      OnOutputVolumeChanged());
+}
+
+void SystemTrayNotifier::NotifyAudioOutputMuteChanged() {
+  FOR_EACH_OBSERVER(
+      AudioObserver,
+      audio_observers_,
+      OnOutputMuteChanged());
+}
+
+void SystemTrayNotifier::NotifyAudioNodesChanged() {
+  FOR_EACH_OBSERVER(
+      AudioObserver,
+      audio_observers_,
+      OnAudioNodesChanged());
+}
+
+void SystemTrayNotifier::NotifyAudioActiveOutputNodeChanged() {
+  FOR_EACH_OBSERVER(
+      AudioObserver,
+      audio_observers_,
+      OnActiveOutputNodeChanged());
+}
+
+void SystemTrayNotifier::NotifyAudioActiveInputNodeChanged() {
+  FOR_EACH_OBSERVER(
+      AudioObserver,
+      audio_observers_,
+      OnActiveInputNodeChanged());
+}
+
 void SystemTrayNotifier::NotifyTracingModeChanged(bool value) {
   FOR_EACH_OBSERVER(
       TracingObserver,
       tracing_observers_,
       OnTracingModeChanged(value));
 }
 
 void SystemTrayNotifier::NotifyRefreshBluetooth() {
   FOR_EACH_OBSERVER(BluetoothObserver,
                     bluetooth_observers_,
@@ skipping 131 matching lines @@
 }
 
 void SystemTrayNotifier::NotifyScreenShareStop() {
   FOR_EACH_OBSERVER(ScreenShareObserver, screen_share_observers_,
                     OnScreenShareStop());
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash