Add callback in VideoDecoder and AudioDecoder to return decoded frames.

media/filters/decoder_stream_traits.h

Index: media/filters/decoder_stream_traits.h
diff --git a/media/filters/decoder_stream_traits.h b/media/filters/decoder_stream_traits.h
index 918f4ac1a28cac889cb3c9d69b05af58267ef956..c0a97777e46be0c304328096643f7c06ab059d62 100644
--- a/media/filters/decoder_stream_traits.h
+++ b/media/filters/decoder_stream_traits.h
@@ -28,12 +28,14 @@ struct DecoderStreamTraits<DemuxerStream::AUDIO> {
   typedef AudioDecoderConfig DecoderConfigType;
   typedef DecryptingAudioDecoder DecryptingDecoderType;
   typedef base::Callback<void(bool success)> StreamInitCB;
+  typedef base::Callback<void(const scoped_refptr<OutputType>&)> OutputCB;
 
   static std::string ToString();
   static void Initialize(DecoderType* decoder,
                          const DecoderConfigType& config,
                          bool low_delay,
-                         const PipelineStatusCB& status_cb);
+                         const PipelineStatusCB& status_cb,
+                         const OutputCB& output_cb);
   static bool FinishInitialization(const StreamInitCB& init_cb,
                                    DecoderType* decoder,
                                    DemuxerStream* stream);
@@ -49,12 +51,14 @@ struct DecoderStreamTraits<DemuxerStream::VIDEO> {
   typedef VideoDecoderConfig DecoderConfigType;
   typedef DecryptingVideoDecoder DecryptingDecoderType;
   typedef base::Callback<void(bool success)> StreamInitCB;
+  typedef base::Callback<void(const scoped_refptr<OutputType>&)> OutputCB;
 
   static std::string ToString();
   static void Initialize(DecoderType* decoder,
                          const DecoderConfigType& config,
                          bool low_delay,
-                         const PipelineStatusCB& status_cb);
+                         const PipelineStatusCB& status_cb,
+                         const OutputCB& output_cb);
   static bool FinishInitialization(const StreamInitCB& init_cb,
                                    DecoderType* decoder,
                                    DemuxerStream* stream);