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

chromeos/dbus/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/cras_audio_client.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
@@ skipping 168 matching lines @@
     dbus::MethodCall method_call(cras::kCrasControlInterface,
                                  cras::kSwapLeftRight);
     dbus::MessageWriter writer(&method_call);
     writer.AppendUint64(node_id);
     writer.AppendBool(swap);
     cras_proxy_->CallMethod(&method_call,
                             dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
                             dbus::ObjectProxy::EmptyResponseCallback());
   }
 
+  void WaitForServiceToBeAvailable(
+      const WaitForServiceToBeAvailableCallback& callback) override {
+    cras_proxy_->WaitForServiceToBeAvailable(callback);
+  }
+
  protected:
   void Init(dbus::Bus* bus) override {
     cras_proxy_ = bus->GetObjectProxy(cras::kCrasServiceName,
                                       dbus::ObjectPath(cras::kCrasServicePath));
 
     // Monitor NameOwnerChanged signal.
     cras_proxy_->SetNameOwnerChangedCallback(
         base::Bind(&CrasAudioClientImpl::NameOwnerChangedReceived,
                    weak_ptr_factory_.GetWeakPtr()));
 
@@ skipping 258 matching lines @@
 
 CrasAudioClient::~CrasAudioClient() {
 }
 
 // static
 CrasAudioClient* CrasAudioClient::Create() {
   return new CrasAudioClientImpl();
 }
 
 }  // namespace chromeos