[Chromecast] Add new volume control API to CastMediaShlib

chromecast/media/cma/backend/alsa/stream_mixer_alsa.cc

 // Copyright 2015 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 "chromecast/media/cma/backend/alsa/stream_mixer_alsa.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <unordered_set>
@@ skipping 251 matching lines @@
       AudioFilterFactory::COMMUNICATION_AUDIO_FILTER));
   filter_groups_.push_back(base::MakeUnique<FilterGroup>(
       std::unordered_set<std::string>({kAlarmAudioDeviceId}),
       AudioFilterFactory::ALARM_AUDIO_FILTER));
   filter_groups_.push_back(base::MakeUnique<FilterGroup>(
       std::unordered_set<std::string>({kTtsAudioDeviceId}),
       AudioFilterFactory::TTS_AUDIO_FILTER));
   filter_groups_.push_back(base::MakeUnique<FilterGroup>(
       std::unordered_set<std::string>(
           {::media::AudioDeviceDescription::kDefaultDeviceId,
-           kEarconAudioDeviceId, ""}),
+           kLocalAudioDeviceId, ""}),
       AudioFilterFactory::MEDIA_AUDIO_FILTER));
 
   DefineAlsaParameters();
 }
 
 void StreamMixerAlsa::ResetTaskRunnerForTest() {
   mixer_task_runner_ = base::ThreadTaskRunnerHandle::Get();
 }
 
 void StreamMixerAlsa::DefineAlsaParameters() {
@@ skipping 679 matching lines @@
   DCHECK(std::find(loopback_observers_.begin(), loopback_observers_.end(),
                    observer) != loopback_observers_.end());
   loopback_observers_.erase(std::remove(loopback_observers_.begin(),
                                         loopback_observers_.end(), observer),
                             loopback_observers_.end());
   observer->OnRemoved();
 }
 
 }  // namespace media
 }  // namespace chromecast