Final cleanup pass over audio device API

extensions/browser/api/audio/audio_service.cc

 // Copyright (c) 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 "extensions/browser/api/audio/audio_service.h"
 
 namespace extensions {
 
 class AudioServiceImpl : public AudioService {
  public:
   AudioServiceImpl() {}
   ~AudioServiceImpl() override {}
 
   // Called by listeners to this service to add/remove themselves as observers.
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
 
   // Start to query audio device information.
   bool GetInfo(OutputInfo* output_info_out, InputInfo* input_info_out) override;
+  bool GetDevices(const api::audio::DeviceFilter* filter,
+                  DeviceInfoList* devices_out) override;
   void SetActiveDevices(const DeviceIdList& device_list) override;
   bool SetActiveDeviceLists(
       const std::unique_ptr<DeviceIdList>& input_devices,
       const std::unique_ptr<DeviceIdList>& output_devives) override;
   bool SetDeviceSoundLevel(const std::string& device_id,
                            int volume,
                            int gain) override;
   bool SetMuteForDevice(const std::string& device_id, bool value) override;
   bool SetMute(bool is_input, bool value) override;
   bool GetMute(bool is_input, bool* value) override;
@@ skipping 10 matching lines @@
 AudioService* AudioService::CreateInstance() {
   return new AudioServiceImpl;
 }
 
 bool AudioServiceImpl::GetInfo(OutputInfo* output_info_out,
                                InputInfo* input_info_out) {
   // TODO: implement this for platforms other than Chrome OS.
   return false;
 }
 
+bool AudioServiceImpl::GetDevices(const api::audio::DeviceFilter* filter,
+                                  DeviceInfoList* devices_out) {
+  return false;
+}
+
 bool AudioServiceImpl::SetActiveDeviceLists(
     const std::unique_ptr<DeviceIdList>& input_devices,
     const std::unique_ptr<DeviceIdList>& output_devives) {
   return false;
 }
 
 void AudioServiceImpl::SetActiveDevices(const DeviceIdList& device_list) {
 }
 
 bool AudioServiceImpl::SetDeviceSoundLevel(const std::string& device_id,
                                            int volume,
                                            int gain) {
   return false;
 }
 
 bool AudioServiceImpl::SetMuteForDevice(const std::string& device_id,
                                         bool value) {
   return false;
 }
 
 bool AudioServiceImpl::SetMute(bool is_input, bool value) {
   return false;
 }
 
 bool AudioServiceImpl::GetMute(bool is_input, bool* value) {
   return false;
 }
 
 }  // namespace extensions