Add ability to active multiple devices via the audio API.

chromeos/dbus/cras_audio_client.cc

Index: chromeos/dbus/cras_audio_client.cc
diff --git a/chromeos/dbus/cras_audio_client.cc b/chromeos/dbus/cras_audio_client.cc
index 779a3de4158158c208035de177a7d182173d0565..aa22c96b0e6a83a8313cebabb6bcf39d7ae28270 100644
--- a/chromeos/dbus/cras_audio_client.cc
+++ b/chromeos/dbus/cras_audio_client.cc
@@ -154,6 +154,26 @@ class CrasAudioClientImpl : public CrasAudioClient {
         dbus::ObjectProxy::EmptyResponseCallback());
   }
 
+  virtual void AddActiveOutputNode(uint64 node_id) OVERRIDE {
+    dbus::MethodCall method_call(cras::kCrasControlInterface,
+                                 cras::kAddActiveOutputNode);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendUint64(node_id);
+    cras_proxy_->CallMethod(&method_call,
+                            dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+                            dbus::ObjectProxy::EmptyResponseCallback());
+  }
+
+  virtual void RemoveActiveOutputNode(uint64 node_id) OVERRIDE {
+    dbus::MethodCall method_call(cras::kCrasControlInterface,
+                                 cras::kRemoveActiveOutputNode);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendUint64(node_id);
+    cras_proxy_->CallMethod(&method_call,
+                            dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+                            dbus::ObjectProxy::EmptyResponseCallback());
+  }
+
  protected:
   virtual void Init(dbus::Bus* bus) OVERRIDE {
     cras_proxy_ = bus->GetObjectProxy(cras::kCrasServiceName,