Sync volume state using cras signal OutputNodeVolumeChanged.

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 88 matching lines @@
     const GetVolumeStateCallback& callback) {
   callback.Run(volume_state_, true);
 }
 
 void FakeCrasAudioClient::GetNodes(const GetNodesCallback& callback,
                                    const ErrorCallback& error_callback) {
   callback.Run(node_list_, true);
 }
 
 void FakeCrasAudioClient::SetOutputNodeVolume(uint64_t node_id,
-                                              int32_t volume) {}
+                                              int32_t volume) {
+  if (!notify_volume_change_with_delay_)
+    NotifyOutputNodeVolumeChangedForTesting(node_id, volume);
+}
 
 void FakeCrasAudioClient::SetOutputUserMute(bool mute_on) {
   volume_state_.output_user_mute = mute_on;
   FOR_EACH_OBSERVER(Observer, observers_,
                     OutputMuteChanged(volume_state_.output_user_mute));
 }
 
 void FakeCrasAudioClient::SetInputNodeGain(uint64_t node_id,
                                            int32_t input_gain) {}
 
@@ skipping 90 matching lines @@
     const AudioNodeList& audio_nodes) {
   node_list_ = audio_nodes;
 }
 
 void FakeCrasAudioClient::SetAudioNodesAndNotifyObserversForTesting(
     const AudioNodeList& new_nodes) {
   SetAudioNodesForTesting(new_nodes);
   FOR_EACH_OBSERVER(Observer, observers_, NodesChanged());
 }
 
+void FakeCrasAudioClient::NotifyOutputNodeVolumeChangedForTesting(
+    uint64_t node_id,
+    int volume) {
+  FOR_EACH_OBSERVER(Observer, observers_,
+                    OutputNodeVolumeChanged(node_id, volume));
+}
+
 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