Browser-wide audio mirroring for TabCapture API

media/audio/audio_manager_base.h

Index: media/audio/audio_manager_base.h
diff --git a/media/audio/audio_manager_base.h b/media/audio/audio_manager_base.h
index 57b4fe44edb67707401d4b55bd4441dcda9c1dea..83ad98b6906ba64e1f5c3c535ac4857f85a1c3d6 100644
--- a/media/audio/audio_manager_base.h
+++ b/media/audio/audio_manager_base.h
@@ -27,6 +27,7 @@ class Thread;
 namespace media {
 
 class AudioOutputDispatcher;
+class VirtualAudioInputStream;
 
 // AudioManagerBase provides AudioManager functions common for all platforms.
 class MEDIA_EXPORT AudioManagerBase : public AudioManager {
@@ -159,6 +160,11 @@ class MEDIA_EXPORT AudioManagerBase : public AudioManager {
   // and GetMessageLoop() starts returning NULL.
   scoped_refptr<base::MessageLoopProxy> message_loop_;
 
+  // Currently active VirtualAudioInputStream. When this is set, we will
+  // create all audio output streams as virtual streams so as to redirect audio
+  // data to this virtual input stream.
+  VirtualAudioInputStream* virtual_audio_input_stream_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };