Add Stop() to AudioDecoder.

media/base/audio_decoder.h

Index: media/base/audio_decoder.h
diff --git a/media/base/audio_decoder.h b/media/base/audio_decoder.h
index aa2eeb80ea8af3ac2936ad70f9e73e43d2b786a3..d16151201f3ed032a0a4db7ce9a13836d4b6f8a3 100644
--- a/media/base/audio_decoder.h
+++ b/media/base/audio_decoder.h
@@ -52,6 +52,13 @@ class MEDIA_EXPORT AudioDecoder {
   // Reset decoder state, dropping any queued encoded data.

[xhwang, 2014/01/08 01:33:37]

nit: since you are here, s/Reset/Resets, same as Initialize on l.31 and Request
on l.38. thanks!

   virtual void Reset(const base::Closure& closure) = 0;
 
+  // Stops decoder, fires any pending callbacks and sets the decoder to an
+  // uninitialized state. An AudioDecoder cannot be re-initialized after it has
+  // been stopped.
+  // Note that if Initialize() has been called, Stop() must be called and
+  // complete before deleting the decoder.
+  virtual void Stop(const base::Closure& closure) = 0;
+
   // Returns various information about the decoded audio format.
   virtual int bits_per_channel() = 0;
   virtual ChannelLayout channel_layout() = 0;