Wire up the output device id and provide an implementation on Windows.

media/audio/audio_output_dispatcher_impl.cc

Index: media/audio/audio_output_dispatcher_impl.cc
diff --git a/media/audio/audio_output_dispatcher_impl.cc b/media/audio/audio_output_dispatcher_impl.cc
index 7e08799e6e6f5942643bb56c205174d39eaa2dac..bcdcd65146e8294813ec65a40f1339b5675e15b3 100644
--- a/media/audio/audio_output_dispatcher_impl.cc
+++ b/media/audio/audio_output_dispatcher_impl.cc
@@ -19,9 +19,11 @@ namespace media {
 AudioOutputDispatcherImpl::AudioOutputDispatcherImpl(
     AudioManager* audio_manager,
     const AudioParameters& params,
+    const std::string& output_device_id,
     const std::string& input_device_id,
     const base::TimeDelta& close_delay)
-    : AudioOutputDispatcher(audio_manager, params, input_device_id),
+    : AudioOutputDispatcher(audio_manager, params, output_device_id,
+          input_device_id),
       pause_delay_(base::TimeDelta::FromMicroseconds(
           2 * params.frames_per_buffer() * base::Time::kMicrosecondsPerSecond /
           static_cast<float>(params.sample_rate()))),
@@ -168,7 +170,7 @@ void AudioOutputDispatcherImpl::Shutdown() {
 bool AudioOutputDispatcherImpl::CreateAndOpenStream() {
   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
   AudioOutputStream* stream = audio_manager_->MakeAudioOutputStream(
-      params_, "", input_device_id_);
+      params_, output_device_id_, input_device_id_);
   if (!stream)
     return false;