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..819372637e9b3ab3bfb9d38957067b72a164b260 100644
--- a/media/mojo/services/mojo_audio_decoder.h
+++ b/media/mojo/services/mojo_audio_decoder.h
@@ -10,6 +10,7 @@
 #include "media/base/audio_decoder.h"
 #include "media/mojo/interfaces/audio_decoder.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_ptr_info.h"
 #include "mojo/public/cpp/system/data_pipe.h"
 
 namespace base {
@@ -63,6 +64,12 @@ 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().
+  mojo::InterfacePtrInfo<interfaces::AudioDecoder> remote_decoder_info_;

[yzshen1, 2016/03/22 19:15:04]

optional: you could use interfaces::AudioDecoderPtrInfo as the type name, too.

[xhwang, 2016/03/22 19:45:26]

Done.

+
   interfaces::AudioDecoderPtr remote_decoder_;
 
   // DataPipe for serializing the data section of DecoderBuffer.