Tracks all open input streams in AudioManagerBase.

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 f8f5260be68ced768966c28b313166d0aa4ff89b..5bee0f1b983bf4cc1665449996789b020fc973f9 100644
--- a/media/audio/audio_manager_base.h
+++ b/media/audio/audio_manager_base.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 #include <string>
+#include <unordered_set>
 #include <utility>
 
 #include "base/compiler_specific.h"
@@ -160,6 +161,12 @@ class MEDIA_EXPORT AudioManagerBase : public AudioManager {
   // Track output state change listeners.
   base::ObserverList<AudioDeviceListener> output_listeners_;
 
+  // Contains currently open fake input/output streams.
+  // TODO(alokp): Remove this after tracking down streams that are not closed
+  // before shutdown: crbug.com/608049.
+  std::unordered_set<AudioOutputStream*> fake_output_streams_;
+  std::unordered_set<AudioInputStream*> fake_input_streams_;
+
   // Map of cached AudioOutputDispatcher instances.  Must only be touched
   // from the audio thread (no locking).
   AudioOutputDispatchers output_dispatchers_;