Persist the user's active audio device choice across chromeos session and reboots.

chromeos/dbus/fake_cras_audio_client.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/fake_cras_audio_client.h"
 
 namespace chromeos {
 
 FakeCrasAudioClient::FakeCrasAudioClient()
     : active_input_node_id_(0),
@@ skipping 156 matching lines @@
 
 void FakeCrasAudioClient::SwapLeftRight(uint64_t node_id, bool swap) {}
 
 void FakeCrasAudioClient::AddActiveOutputNode(uint64_t node_id) {
   for (size_t i = 0; i < node_list_.size(); ++i) {
     if (node_list_[i].id == node_id)
       node_list_[i].active = true;
   }
 }
 
+void FakeCrasAudioClient::WaitForServiceToBeAvailable(
+    const WaitForServiceToBeAvailableCallback& callback) {
+  callback.Run(true);
+}
+
 void FakeCrasAudioClient::RemoveActiveOutputNode(uint64_t node_id) {
   for (size_t i = 0; i < node_list_.size(); ++i) {
     if (node_list_[i].id == node_id)
       node_list_[i].active = false;
   }
 }
 
 void FakeCrasAudioClient::InsertAudioNodeToList(const AudioNode& audio_node) {
   auto iter = FindNode(audio_node.id);
   if (iter != node_list_.end())
@@ skipping 22 matching lines @@
   FOR_EACH_OBSERVER(Observer, observers_, NodesChanged());
 }
 
 AudioNodeList::iterator FakeCrasAudioClient::FindNode(uint64_t node_id) {
   return std::find_if(
       node_list_.begin(), node_list_.end(),
       [node_id](const AudioNode& node) { return node_id == node.id; });
 }
 
 }  // namespace chromeos