Caching AudioOutputDevice instances in mixer manager

media/renderers/audio_renderer_impl.cc

Index: media/renderers/audio_renderer_impl.cc
diff --git a/media/renderers/audio_renderer_impl.cc b/media/renderers/audio_renderer_impl.cc
index 5853864bf278f19e39e9f5242d7bea761316da52..c7e63e07d7d58d301bebf04faf5edb173bce3005 100644
--- a/media/renderers/audio_renderer_impl.cc
+++ b/media/renderers/audio_renderer_impl.cc
@@ -36,14 +36,12 @@ AudioRendererImpl::AudioRendererImpl(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     media::AudioRendererSink* sink,
     ScopedVector<AudioDecoder> decoders,
-    const AudioHardwareConfig& hardware_config,
     const scoped_refptr<MediaLog>& media_log)
     : task_runner_(task_runner),
       expecting_config_changes_(false),
       sink_(sink),
       audio_buffer_stream_(
           new AudioBufferStream(task_runner, std::move(decoders), media_log)),
-      hardware_config_(hardware_config),
       media_log_(media_log),
       client_(nullptr),
       tick_clock_(new base::DefaultTickClock()),
@@ -333,7 +331,8 @@ void AudioRendererImpl::Initialize(DemuxerStream* stream,
   // failed.
   init_cb_ = BindToCurrentLoop(init_cb);
 
-  const AudioParameters& hw_params = hardware_config_.GetOutputConfig();
+  const AudioParameters& hw_params =
+      sink_->GetOutputDeviceInfo().output_params();
   expecting_config_changes_ = stream->SupportsConfigChanges();
   if (!expecting_config_changes_ || !hw_params.IsValid() ||
       hw_params.format() == AudioParameters::AUDIO_FAKE) {