Store audio device's active state in preference

chromeos/dbus/audio_node.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/dbus/audio_node.h"
 
 #include <stdint.h>
 
 #include "base/format_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 
 namespace chromeos {
 
 AudioNode::AudioNode()
     : is_input(false),
       id(0),
       active(false),
       plugged_time(0) {
 }
 
 AudioNode::AudioNode(bool is_input,
                      uint64_t id,
+                     uint64_t stable_device_id,
                      std::string device_name,
                      std::string type,
                      std::string name,
                      bool active,
                      uint64_t plugged_time)
     : is_input(is_input),
       id(id),
+      stable_device_id(stable_device_id),
       device_name(device_name),
       type(type),
       name(name),
       active(active),
       plugged_time(plugged_time) {}
 
 AudioNode::~AudioNode() {}
 
 std::string AudioNode::ToString() const {
   std::string result;
   base::StringAppendF(&result,
                       "is_input = %s ",
                       is_input ? "true" : "false");
   base::StringAppendF(&result,
                       "id = 0x%" PRIx64 " ",
                       id);
-  base::StringAppendF(&result,
-                      "device_name = %s ",
-                      device_name.c_str());
+  base::StringAppendF(&result, "stable_device_id = 0x%" PRIx64 " ",
+                      stable_device_id);
+  base::StringAppendF(&result, "device_name = %s ", device_name.c_str());
   base::StringAppendF(&result,
                       "type = %s ",
                       type.c_str());
   base::StringAppendF(&result,
                       "name = %s ",
                       name.c_str());
   base::StringAppendF(&result,
                       "active = %s ",
                       active ? "true" : "false");
   base::StringAppendF(&result,
                       "plugged_time= %s ",
                       base::Uint64ToString(plugged_time).c_str());
 
   return result;
 }
 
 }  // namespace chromeos