media: Use PassInterface() in mojo media classes

media/mojo/services/mojo_audio_decoder.h

Index: media/mojo/services/mojo_audio_decoder.h
diff --git a/media/mojo/services/mojo_audio_decoder.h b/media/mojo/services/mojo_audio_decoder.h
index 3f0d58fa4e1167d5bd878615e884b65e8dbfa549..ae6097d44bb2cd83c0bba1779132a3ae130d7dd5 100644
--- a/media/mojo/services/mojo_audio_decoder.h
+++ b/media/mojo/services/mojo_audio_decoder.h
@@ -63,6 +63,12 @@ class MojoAudioDecoder : public AudioDecoder,
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
+  // This class is constructed on one thread and used exclusively on another
+  // thread. This member is used to safely pass the AudioDecoderPtr from one
+  // thread to another. It is set in the constructor and is consumed in
+  // Initialize().
+  interfaces::AudioDecoderPtrInfo remote_decoder_info_;
+
   interfaces::AudioDecoderPtr remote_decoder_;
 
   // DataPipe for serializing the data section of DecoderBuffer.