mash: Have chrome set itself as a controller interface for changing volume

chrome/browser/ui/ash/volume_controller_chromeos.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 "chrome/browser/ui/ash/volume_controller_chromeos.h"
-
-#include "base/command_line.h"
-#include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
-#include "chrome/grit/browser_resources.h"
-#include "chromeos/audio/chromeos_sounds.h"
-#include "chromeos/audio/cras_audio_handler.h"
-#include "chromeos/chromeos_switches.h"
-#include "media/audio/sounds/sounds_manager.h"
-#include "ui/base/resource/resource_bundle.h"
-
-namespace {
-
-// Percent by which the volume should be changed when a volume key is pressed.
-const double kStepPercentage = 4.0;
-
-bool VolumeAdjustSoundEnabled() {
-  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
-      chromeos::switches::kDisableVolumeAdjustSound);
-}
-
-void PlayVolumeAdjustSound() {
-  if (VolumeAdjustSoundEnabled()) {
-    chromeos::AccessibilityManager::Get()->PlayEarcon(
-        chromeos::SOUND_VOLUME_ADJUST,
-        chromeos::PlaySoundOption::SPOKEN_FEEDBACK_ENABLED);
-  }
-}
-
-}  // namespace
-
-VolumeController::VolumeController() {
-  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
-  if (VolumeAdjustSoundEnabled()) {
-    media::SoundsManager::Get()->Initialize(
-        chromeos::SOUND_VOLUME_ADJUST,
-        bundle.GetRawDataResource(IDR_SOUND_VOLUME_ADJUST_WAV));
-  }
-}
-
-VolumeController::~VolumeController() {}
-
-void VolumeController::BindRequest(
-    ash::mojom::VolumeControllerRequest request) {
-  bindings_.AddBinding(this, std::move(request));
-}
-
-void VolumeController::VolumeMute() {
-  chromeos::CrasAudioHandler::Get()->SetOutputMute(true);
-}
-
-void VolumeController::VolumeDown() {
-  chromeos::CrasAudioHandler* audio_handler = chromeos::CrasAudioHandler::Get();
-  if (audio_handler->IsOutputMuted()) {
-    audio_handler->SetOutputVolumePercent(0);
-  } else {
-    audio_handler->AdjustOutputVolumeByPercent(-kStepPercentage);
-    if (audio_handler->IsOutputVolumeBelowDefaultMuteLevel())
-      audio_handler->SetOutputMute(true);
-    else
-      PlayVolumeAdjustSound();
-  }
-}
-
-void VolumeController::VolumeUp() {
-  chromeos::CrasAudioHandler* audio_handler = chromeos::CrasAudioHandler::Get();
-  bool play_sound = false;
-  if (audio_handler->IsOutputMuted()) {
-    audio_handler->SetOutputMute(false);
-    audio_handler->AdjustOutputVolumeToAudibleLevel();
-    play_sound = true;
-  } else {
-    play_sound = audio_handler->GetOutputVolumePercent() != 100;
-    audio_handler->AdjustOutputVolumeByPercent(kStepPercentage);
-  }
-
-  if (play_sound)
-    PlayVolumeAdjustSound();
-}