Add a new audio extension event OnLevelChanged.

extensions/browser/api/audio/audio_service_linux.cc

Index: extensions/browser/api/audio/audio_service_linux.cc
diff --git a/extensions/browser/api/audio/audio_service_linux.cc b/extensions/browser/api/audio/audio_service_linux.cc
deleted file mode 100644
index 4e70cef40ffb096ebd823e495cf20e0f2d9de616..0000000000000000000000000000000000000000
--- a/extensions/browser/api/audio/audio_service_linux.cc
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2014 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"
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "base/observer_list.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/threading/thread_checker.h"
-#include "content/public/browser/browser_thread.h"
-
-using content::BrowserThread;
-
-namespace extensions {
-
-using core_api::audio::OutputDeviceInfo;
-using core_api::audio::InputDeviceInfo;
-
-class AudioServiceImpl : public AudioService {
- public:
-  AudioServiceImpl();
-  ~AudioServiceImpl() override;
-
- private:
-  // Called by listeners to this service to add/remove themselves as observers.
-  void AddObserver(AudioService::Observer* observer) override;
-  void RemoveObserver(AudioService::Observer* observer) override;
-
-  // Start to query audio device information.
-  void StartGetInfo(const GetInfoCallback& callback) override;
-  void SetActiveDevices(const DeviceIdList& device_list) override;
-  bool SetDeviceProperties(const std::string& device_id,
-                           bool muted,
-                           int volume,
-                           int gain) override;
-
-  // List of observers.
-  ObserverList<AudioService::Observer> observer_list_;
-
-  base::ThreadChecker thread_checker_;
-
-  // Note: This should remain the last member so it'll be destroyed and
-  // invalidate the weak pointers before any other members are destroyed.
-  base::WeakPtrFactory<AudioServiceImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioServiceImpl);
-};
-
-AudioServiceImpl::AudioServiceImpl() : weak_ptr_factory_(this) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-AudioServiceImpl::~AudioServiceImpl() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-void AudioServiceImpl::AddObserver(AudioService::Observer* observer) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  observer_list_.AddObserver(observer);
-}
-
-void AudioServiceImpl::RemoveObserver(AudioService::Observer* observer) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  observer_list_.RemoveObserver(observer);
-}
-
-void AudioServiceImpl::StartGetInfo(const GetInfoCallback& callback) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  if (!callback.is_null())
-    callback.Run(OutputInfo(), InputInfo(), false);
-}
-
-void AudioServiceImpl::SetActiveDevices(const DeviceIdList& device_list) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-bool AudioServiceImpl::SetDeviceProperties(const std::string& device_id,
-                                           bool muted,
-                                           int volume,
-                                           int gain) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  return false;
-}
-
-AudioService* AudioService::CreateInstance() {
-  return new AudioServiceImpl;
-}
-
-}  // namespace extensions