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

chrome/browser/ui/ash/system_tray_delegate_chromeos.cc

 // 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.
 
 #include "chrome/browser/ui/ash/system_tray_delegate_chromeos.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 71 matching lines @@
 #include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/chromeos/charger_replacement_handler.h"
 #include "chrome/browser/ui/webui/chromeos/mobile_setup_dialog.h"
 #include "chrome/browser/upgrade_detector.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "chromeos/ime/extension_ime_util.h"
 #include "chromeos/ime/input_method_manager.h"
 #include "chromeos/ime/xkeyboard.h"
 #include "chromeos/login/login_state.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 183 matching lines @@
       chrome::NOTIFICATION_CROS_ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK,
       content::NotificationService::AllSources());
   registrar_->Add(
       this,
       chrome::NOTIFICATION_CROS_ACCESSIBILITY_TOGGLE_HIGH_CONTRAST_MODE,
       content::NotificationService::AllSources());
   registrar_->Add(
       this,
       chrome::NOTIFICATION_CROS_ACCESSIBILITY_TOGGLE_VIRTUAL_KEYBOARD,
       content::NotificationService::AllSources());
+
+  CrasAudioHandler::Get()->AddAudioObserver(this);
 }
 
 void SystemTrayDelegateChromeOS::Initialize() {
   DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
 
   input_method::InputMethodManager::Get()->AddObserver(this);
   UpdateClockType();
 
   if (SystemKeyEventListener::GetInstance())
     SystemKeyEventListener::GetInstance()->AddCapsLockObserver(this);
@@ skipping 57 matching lines @@
     SystemKeyEventListener::GetInstance()->RemoveCapsLockObserver(this);
   bluetooth_adapter_->RemoveObserver(this);
   ash::Shell::GetInstance()
       ->session_state_delegate()
       ->RemoveSessionStateObserver(this);
   LoginState::Get()->RemoveObserver(this);
 
   // Stop observing Drive operations.
   UnobserveDriveUpdates();
 
+  CrasAudioHandler::Get()->RemoveAudioObserver(this);
+
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   policy::DeviceCloudPolicyManagerChromeOS* policy_manager =
       connector->GetDeviceCloudPolicyManager();
   if (policy_manager)
     policy_manager->core()->store()->RemoveObserver(this);
 }
 
 // Overridden from ash::SystemTrayDelegate:
 bool SystemTrayDelegateChromeOS::GetTrayVisibilityOnStartup() {
@@ skipping 813 matching lines @@
     show_message = false;
   }
   GetSystemTrayNotifier()->NotifyRefreshIME(show_message);
 }
 
 void SystemTrayDelegateChromeOS::InputMethodPropertyChanged(
     input_method::InputMethodManager* manager) {
   GetSystemTrayNotifier()->NotifyRefreshIME(false);
 }
 
+// Overridden from CrasAudioHandler::AudioObserver.
+void SystemTrayDelegateChromeOS::OnOutputVolumeChanged() {
+  GetSystemTrayNotifier()->NotifyAudioOutputVolumeChanged();
+}
+
+void SystemTrayDelegateChromeOS::OnOutputMuteChanged() {
+  GetSystemTrayNotifier()->NotifyAudioOutputMuteChanged();
+}
+
+void SystemTrayDelegateChromeOS::OnInputGainChanged() {
+}
+
+void SystemTrayDelegateChromeOS::OnInputMuteChanged() {
+}
+
+void SystemTrayDelegateChromeOS::OnAudioNodesChanged() {
+  GetSystemTrayNotifier()->NotifyAudioNodesChanged();
+}
+
+void SystemTrayDelegateChromeOS::OnActiveOutputNodeChanged() {
+  GetSystemTrayNotifier()->NotifyAudioActiveOutputNodeChanged();
+}
+
+void SystemTrayDelegateChromeOS::OnActiveInputNodeChanged() {
+  GetSystemTrayNotifier()->NotifyAudioActiveInputNodeChanged();
+}
+
 // drive::JobListObserver overrides.
 void SystemTrayDelegateChromeOS::OnJobAdded(const drive::JobInfo& job_info) {
   OnJobUpdated(job_info);
 }
 
 void SystemTrayDelegateChromeOS::OnJobDone(const drive::JobInfo& job_info,
                                            drive::FileError error) {
   ash::DriveOperationStatus status;
   if (ConvertToFinishedDriveOperationStatus(job_info, error, &status))
     GetSystemTrayNotifier()->NotifyDriveJobUpdated(status);
@@ skipping 82 matching lines @@
 void SystemTrayDelegateChromeOS::UserAddedToSession(
     const std::string& user_id) {
   GetSystemTrayNotifier()->NotifyUserAddedToSession();
 }
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate() {
   return new SystemTrayDelegateChromeOS();
 }
 
 }  // namespace chromeos