Adding ArcBridge Interface for Volume Update Requests

components/arc/audio/arc_audio_bridge.cc

Index: components/arc/audio/arc_audio_bridge.cc
diff --git a/components/arc/audio/arc_audio_bridge.cc b/components/arc/audio/arc_audio_bridge.cc
index bdf7e4feafce96eb955d6e98bff5e3a6a36b2686..37a51647e75097e73f6c291b645fcda6590f19c6 100644
--- a/components/arc/audio/arc_audio_bridge.cc
+++ b/components/arc/audio/arc_audio_bridge.cc
@@ -39,6 +39,18 @@ void ArcAudioBridge::ShowVolumeControls() {
   ash::TrayAudio::ShowPopUpVolumeView();
 }
 
+void ArcAudioBridge::OnVolumeUpdateRequest(float volume) {
+  cras_audio_handler_->SetOutputVolumePercent(volume);
+  if (!cras_audio_handler_->IsOutputMuted() &&
+      volume <= cras_audio_handler_->GetOutputDefaultVolumeMuteThreshold()) {

[Luis Héctor Chávez, 2017/04/12 15:10:11]

how about:

bool is_muted = volume <=
cras_audio_handler_->GetOutputDefaultVolumeMuteThreshold();

if (cras_audio_handler_->IsOutputMuted() != is_muted)
  cras_audio_handler_->SetOutputMute(is_muted);

[yueli, 2017/04/12 20:21:59]

Done.

+    cras_audio_handler_->SetOutputMute(true);
+  } else if (cras_audio_handler_->IsOutputMuted() &&
+             volume >
+                 cras_audio_handler_->GetOutputDefaultVolumeMuteThreshold()) {
+    cras_audio_handler_->SetOutputMute(false);
+  }
+}
+
 void ArcAudioBridge::OnAudioNodesChanged() {
   uint64_t output_id = cras_audio_handler_->GetPrimaryActiveOutputNode();
   const chromeos::AudioDevice* output_device =