[chrome.displaySource] Integrate audio encoders into media pipeline.

extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h

Index: extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h
diff --git a/extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h b/extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h
index bb23784e7ce88ab8d4d363cad29cf107e27ca05d..4506ff7564a07dc43b0a9aad45f35de324fb0292 100644
--- a/extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h
+++ b/extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h
@@ -23,6 +23,7 @@ class ServiceRegistry;
 }  // namespace content
 
 namespace extensions {
+class WiFiDisplayAudioSink;
 class WiFiDisplayVideoSink;
 class WiFiDisplayMediaPipeline;
 class WiFiDisplaySessionService;
@@ -75,6 +76,7 @@ class WiFiDisplayMediaManager : public wds::SourceMediaManager {
   blink::WebMediaStreamTrack video_track_;
   blink::WebMediaStreamTrack audio_track_;
 
+  std::unique_ptr<WiFiDisplayAudioSink> audio_sink_;
   std::unique_ptr<WiFiDisplayVideoSink> video_sink_;
 
   content::ServiceRegistry* service_registry_;