media: Use IPC_STRUCT_TRAITS to convert SubsampleEntry for mojo

media/base/ipc/media_param_traits_macros.h

Index: media/base/ipc/media_param_traits_macros.h
diff --git a/media/base/ipc/media_param_traits_macros.h b/media/base/ipc/media_param_traits_macros.h
index b3740f9c814166e83c2fec0d659afbde6b483233..6461ccf112c9cf28bfbd491d0e58938fed64a266 100644
--- a/media/base/ipc/media_param_traits_macros.h
+++ b/media/base/ipc/media_param_traits_macros.h
@@ -7,6 +7,7 @@
 
 #include "ipc/ipc_message_macros.h"
 #include "media/base/audio_parameters.h"
+#include "media/base/subsample_entry.h"
 #include "media/base/video_capture_types.h"
 #include "media/base/video_types.h"
 
@@ -18,4 +19,9 @@ IPC_ENUM_TRAITS_MAX_VALUE(media::AudioLatency::LatencyType,
 IPC_ENUM_TRAITS_MAX_VALUE(media::VideoPixelFormat, media::PIXEL_FORMAT_MAX)
 IPC_ENUM_TRAITS_MAX_VALUE(media::VideoPixelStorage, media::PIXEL_STORAGE_MAX)
 
+IPC_STRUCT_TRAITS_BEGIN(media::SubsampleEntry)
+  IPC_STRUCT_TRAITS_MEMBER(clear_bytes)
+  IPC_STRUCT_TRAITS_MEMBER(cypher_bytes)
+IPC_STRUCT_TRAITS_END()
+
 #endif  // MEDIA_BASE_IPC_MEDIA_PARAM_TRAITS_MACROS_H_