Moved the fake input stream's processing onto the audio worker thread.

media/audio/audio_io.h

Index: media/audio/audio_io.h
diff --git a/media/audio/audio_io.h b/media/audio/audio_io.h
index e3b5c60e471f04484df5fd0f926f51490969d26d..56392154e3229a062a77fd8b1d9ba12090558bca 100644
--- a/media/audio/audio_io.h
+++ b/media/audio/audio_io.h
@@ -56,6 +56,8 @@ class MEDIA_EXPORT AudioOutputStream {
   // itself such as creating Windows or initializing COM.
   class MEDIA_EXPORT AudioSourceCallback {
    public:
+    virtual ~AudioSourceCallback() {}
+
     // Provide more data by fully filling |dest|.  The source will return
     // the number of frames it filled.  |total_bytes_delay| contains current
     // number of bytes of delay buffered by the AudioOutputStream.
@@ -66,9 +68,6 @@ class MEDIA_EXPORT AudioOutputStream {
     // a good place to stop accumulating sound data since is is likely that
     // playback will not continue.
     virtual void OnError(AudioOutputStream* stream) = 0;
-
-   protected:
-    virtual ~AudioSourceCallback() {}
   };
 
   virtual ~AudioOutputStream() {}