Add ability to active multiple devices via the audio API.

chromeos/dbus/cras_audio_client_stub_impl.cc

Index: chromeos/dbus/cras_audio_client_stub_impl.cc
diff --git a/chromeos/dbus/cras_audio_client_stub_impl.cc b/chromeos/dbus/cras_audio_client_stub_impl.cc
index c48d743c9fbd44963bc5ab3db02f321a1d20bf3a..633db7b2f68993a089791d72e1065e08afd4f596 100644
--- a/chromeos/dbus/cras_audio_client_stub_impl.cc
+++ b/chromeos/dbus/cras_audio_client_stub_impl.cc
@@ -137,9 +137,31 @@ void CrasAudioClientStubImpl::SetActiveInputNode(uint64 node_id) {
 }
 
 void CrasAudioClientStubImpl::AddActiveInputNode(uint64 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 CrasAudioClientStubImpl::RemoveActiveInputNode(uint64 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 CrasAudioClientStubImpl::AddActiveOutputNode(uint64 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 CrasAudioClientStubImpl::RemoveActiveOutputNode(uint64 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 CrasAudioClientStubImpl::SetAudioDevices(