MediaLog: Log selected audio/video decoder name.

media/filters/decoder_stream.h

Index: media/filters/decoder_stream.h
diff --git a/media/filters/decoder_stream.h b/media/filters/decoder_stream.h
index 5afd0b87ede6a5e735bf4f854a7bb742419752f6..c2616d27a6cc84cfa32d74b8a7a48aee3f6b40ea 100644
--- a/media/filters/decoder_stream.h
+++ b/media/filters/decoder_stream.h
@@ -15,6 +15,7 @@
 #include "media/base/decryptor.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_export.h"
+#include "media/base/media_log.h"
 #include "media/base/pipeline_status.h"
 #include "media/filters/decoder_selector.h"
 #include "media/filters/decoder_stream_traits.h"
@@ -52,7 +53,8 @@ class MEDIA_EXPORT DecoderStream {
   DecoderStream(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       ScopedVector<Decoder> decoders,
-      const SetDecryptorReadyCB& set_decryptor_ready_cb);
+      const SetDecryptorReadyCB& set_decryptor_ready_cb,
+      const scoped_refptr<MediaLog>& media_log);
   virtual ~DecoderStream();
 
   // Initializes the DecoderStream and returns the initialization result
@@ -159,6 +161,8 @@ class MEDIA_EXPORT DecoderStream {
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
+  const scoped_refptr<MediaLog>& media_log_;
+
   State state_;
 
   StatisticsCB statistics_cb_;