Store audio device's active state in preference

chromeos/audio/audio_device.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/audio_device.h"
 
 #include <stdint.h>
 
 #include "base/format_macros.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 91 matching lines @@
     return AUDIO_TYPE_POST_MIX_LOOPBACK;
   else if (node_type.find("POST_DSP_LOOPBACK") != std::string::npos)
     return AUDIO_TYPE_POST_DSP_LOOPBACK;
   else
     return AUDIO_TYPE_OTHER;
 }
 
 AudioDevice::AudioDevice()
     : is_input(false),
       id(0),
+      stable_device_id(0),
       display_name(""),
       type(AUDIO_TYPE_OTHER),
       priority(0),
       active(false),
       plugged_time(0) {
 }
 
 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;
   else
     display_name = node.device_name;
   device_name = node.device_name;
   mic_positions = node.mic_positions;
   priority = GetDevicePriority(type, node.is_input);
   active = node.active;
   plugged_time = node.plugged_time;
@@ skipping 16 matching lines @@
   base::StringAppendF(&result,
                       "type = %s ",
                       GetTypeString(type).c_str());
   base::StringAppendF(&result,
                       "active = %s ",
                       active ? "true" : "false");
   base::StringAppendF(&result,
                       "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;
 }
 
 }  // namespace chromeos