Store audio device's active state in preference

chromeos/audio/audio_device.cc

Index: chromeos/audio/audio_device.cc
diff --git a/chromeos/audio/audio_device.cc b/chromeos/audio/audio_device.cc
index 5374194edd0eb1d7f3d1f01cc792941167ded10a..bba79db6e311a5db21f9a4f3c31f0e9aeaf17465 100644
--- a/chromeos/audio/audio_device.cc
+++ b/chromeos/audio/audio_device.cc
@@ -109,6 +109,7 @@ AudioDeviceType AudioDevice::GetAudioType(
 AudioDevice::AudioDevice()
     : is_input(false),
       id(0),
+      stable_device_id(0),
       display_name(""),
       type(AUDIO_TYPE_OTHER),
       priority(0),
@@ -119,6 +120,7 @@ AudioDevice::AudioDevice()
 AudioDevice::AudioDevice(const AudioNode& node) {
   is_input = node.is_input;
   id = node.id;
+  stable_device_id = node.stable_device_id;
   type = GetAudioType(node.type);
   if (!node.name.empty() && node.name != "(default)")
     display_name = node.name;
@@ -155,6 +157,8 @@ std::string AudioDevice::ToString() const {
                       "plugged_time= %s ",
                       base::Uint64ToString(plugged_time).c_str());
   base::StringAppendF(&result, "mic_positions = %s ", mic_positions.c_str());
+  base::StringAppendF(&result, "stable_device_id = %lu ",
+                      stable_device_id);

[jennyz, 2016/01/05 23:46:55]

nit: how about moving this after line 143 to keep the sequence of the properties
consistent with their declaration?

[hychao, 2016/01/06 06:34:12]

Done.

 
   return result;
 }