Unmute Tab Audio For Desktop Share

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 1f5c358ae3cedc04cc4ca90ea3aeb468ff7b335f..083a008c3bc02f034fc4653ffecc7369f6f4f6f0 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -6,8 +6,8 @@
 #define MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_
 
 #include <stdint.h>
-
 #include <memory>
+#include <set>
 
 #include "base/atomic_ref_count.h"
 #include "base/callback.h"
@@ -178,6 +178,8 @@ class MEDIA_EXPORT AudioOutputController
   const AudioParameters& GetAudioParameters() override;
   void StartDiverting(AudioOutputStream* to_stream) override;
   void StopDiverting() override;
+  void StartDuplicating(AudioPushSink* sink) override;
+  void StopDuplicating(AudioPushSink* sink) override;
 
   // Accessor for AudioPowerMonitor::ReadCurrentPowerAndClip().  See comments in
   // audio_power_monitor.h for usage.  This may be called on any thread.
@@ -218,6 +220,8 @@ class MEDIA_EXPORT AudioOutputController
   void DoReportError();
   void DoStartDiverting(AudioOutputStream* to_stream);
   void DoStopDiverting();
+  void DoStartDuplicating(AudioPushSink* sink);
+  void DoStopDuplicating(AudioPushSink* sink);
 
   // Helper method that stops the physical stream.
   void StopStream();
@@ -241,6 +245,10 @@ class MEDIA_EXPORT AudioOutputController
   // When non-NULL, audio is being diverted to this stream.
   AudioOutputStream* diverting_to_stream_;
 
+  // The targets for audio stream to be copied to.
+  std::set<AudioPushSink*> duplication_targets_;
+  base::Lock duplication_targets_lock_;
+
   // The current volume of the audio stream.
   double volume_;