Implement new slider control and disable the volume control when audio is muted.

chrome/browser/chromeos/audio/audio_handler.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/chromeos/audio/audio_handler.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/logging.h"
@@ skipping 96 matching lines @@
   SetVolumePercent(mixer_->GetVolumePercent() + adjust_by_percent);
 }
 
 bool AudioHandler::IsMuted() {
   return mixer_->IsMuted();
 }
 
 void AudioHandler::SetMuted(bool mute) {
   mixer_->SetMuted(mute);
   prefs_->SetInteger(prefs::kAudioMute, mute ? kPrefMuteOn : kPrefMuteOff);
-  FOR_EACH_OBSERVER(VolumeObserver, volume_observers_, OnVolumeChanged());
+  FOR_EACH_OBSERVER(VolumeObserver, volume_observers_, OnMuteToggled());
 }
 
 void AudioHandler::AddVolumeObserver(VolumeObserver* observer) {
   volume_observers_.AddObserver(observer);
 }
 
 void AudioHandler::RemoveVolumeObserver(VolumeObserver* observer) {
   volume_observers_.RemoveObserver(observer);
 }
 
 AudioHandler::AudioHandler(AudioMixer* mixer)
     : mixer_(mixer),
       prefs_(g_browser_process->local_state()) {
   mixer_->SetVolumePercent(prefs_->GetDouble(prefs::kAudioVolumePercent));
   mixer_->SetMuted(prefs_->GetInteger(prefs::kAudioMute) == kPrefMuteOn);
   mixer_->Init();
 }
 
 AudioHandler::~AudioHandler() {
   mixer_.reset();
 };
 
 }  // namespace chromeos