Make SystemMonitor report all audio device changes instead of just audio capture.

chromeos/audio/cras_audio_handler.cc

 // Copyright (c) 2013 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 "chromeos/audio/cras_audio_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1264 matching lines @@
 
   if (!active_node_id || hotplug_nodes.empty() || hotplug_nodes.size() > 1) {
     HandleNonHotplugNodesChange(is_input, hotplug_nodes, has_device_change,
                                 has_device_removed, active_device_removed);
   } else {
     // Typical user hotplug case.
     HandleHotPlugDevice(hotplug_nodes.top(), devices_pq);
   }
 
   // content::MediaStreamManager listens to
-  // base::SystemMonitor::DevicesChangedObserver for audio capture devices,
+  // base::SystemMonitor::DevicesChangedObserver for audio devices,
   // and updates EnumerateDevices when OnDevicesChanged is called.
-  if (is_input) {
-    base::SystemMonitor* monitor = base::SystemMonitor::Get();
-    // In some unittest, |monitor| might be nullptr.
-    if (!monitor)
-      return;
-    monitor->ProcessDevicesChanged(
-        base::SystemMonitor::DeviceType::DEVTYPE_AUDIO_CAPTURE);
-  }
+  base::SystemMonitor* monitor = base::SystemMonitor::Get();
+  // In some unittest, |monitor| might be nullptr.
+  if (!monitor)
+    return;
+  monitor->ProcessDevicesChanged(
+      base::SystemMonitor::DeviceType::DEVTYPE_AUDIO);
 }
 
 void CrasAudioHandler::HandleGetNodes(const chromeos::AudioNodeList& node_list,
                                       bool success) {
   if (!success) {
     LOG_IF(ERROR, log_errors_) << "Failed to retrieve audio nodes data";
     return;
   }
 
   UpdateDevicesAndSwitchActive(node_list);
@@ skipping 91 matching lines @@
                      hdmi_rediscover_grace_period_duration_in_ms_),
       this, &CrasAudioHandler::UpdateAudioAfterHDMIRediscoverGracePeriod);
 }
 
 void CrasAudioHandler::SetHDMIRediscoverGracePeriodForTesting(
     int duration_in_ms) {
   hdmi_rediscover_grace_period_duration_in_ms_ = duration_in_ms;
 }
 
 }  // namespace chromeos