Unmute Tab Audio For Desktop Share

media/audio/audio_source_diverter.h

Index: media/audio/audio_source_diverter.h
diff --git a/media/audio/audio_source_diverter.h b/media/audio/audio_source_diverter.h
index 787ddec7867dfd693ce04623ca1bb23d4ca2c949..0d432df5a3a526a336de2b4fd8e3be018bd54baf 100644
--- a/media/audio/audio_source_diverter.h
+++ b/media/audio/audio_source_diverter.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_AUDIO_AUDIO_SOURCE_DIVERTER_H_
 #define MEDIA_AUDIO_AUDIO_SOURCE_DIVERTER_H_
 
+#include "media/audio/virtual_audio_sink.h"
 #include "media/base/media_export.h"
 
 // Audio sources may optionally implement AudioSourceDiverter to temporarily
@@ -31,7 +32,14 @@ public:
   // responsible for making sure the stream is closed, perhaps asynchronously.
   virtual void StopDiverting() = 0;
 
-protected:
+  // Start duplicating the current audio stream, and push the copied data into
+  // |sink|.
+  virtual void StartDuplicating(AudioPushSink* sink) = 0;
+
+  // Stop duplicating for the specified |sink|.
+  virtual void StopDuplicating(AudioPushSink* sink) = 0;
+
+ protected:
   virtual ~AudioSourceDiverter() {}
 };