Store audio device's active state in preference

chromeos/dbus/audio_node.cc

Index: chromeos/dbus/audio_node.cc
diff --git a/chromeos/dbus/audio_node.cc b/chromeos/dbus/audio_node.cc
index 17dd6979c036f56ec0736fb17b6709a8f6c7c1da..832b413e6ac75ff60a65afb44aa96ae53a148e9c 100644
--- a/chromeos/dbus/audio_node.cc
+++ b/chromeos/dbus/audio_node.cc
@@ -21,6 +21,7 @@ AudioNode::AudioNode()
 
 AudioNode::AudioNode(bool is_input,
                      uint64_t id,
+                     uint64_t stable_device_id,
                      std::string device_name,
                      std::string type,
                      std::string name,
@@ -28,6 +29,7 @@ AudioNode::AudioNode(bool is_input,
                      uint64_t plugged_time)
     : is_input(is_input),
       id(id),
+      stable_device_id(stable_device_id),
       device_name(device_name),
       type(type),
       name(name),
@@ -45,6 +47,9 @@ std::string AudioNode::ToString() const {
                       "id = 0x%" PRIx64 " ",
                       id);
   base::StringAppendF(&result,
+                      "stable_device_id = 0x%" PRIx64 " ",
+                      stable_device_id);
+  base::StringAppendF(&result,
                       "device_name = %s ",
                       device_name.c_str());
   base::StringAppendF(&result,