media: Use IPC_STRUCT_TRAITS to convert SubsampleEntry for mojo

media/mojo/interfaces/media_types.mojom

Index: media/mojo/interfaces/media_types.mojom
diff --git a/media/mojo/interfaces/media_types.mojom b/media/mojo/interfaces/media_types.mojom
index bd61064c2296024b46bda0459180df07327343df..543352d7d79267859abf7861649d950900e4534f 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -4,6 +4,7 @@
 
 module media.mojom;
 
+import "media/mojo/interfaces/subsample_entry.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "mojo/common/common_custom_types.mojom";
 
@@ -240,13 +241,6 @@ struct VideoDecoderConfig {
   EncryptionScheme encryption_scheme;
 };
 
-// This defines a mojo transport format for media::SubsampleEntry.
-// See media/base/decrypt_config.h for descriptions.
-struct SubsampleEntry {
-  uint32 clear_bytes;
-  uint32 cypher_bytes;
-};
-
 // This defines a mojo transport format for media::DecryptConfig.
 // See media/base/decrypt_config.h for descriptions.
 struct DecryptConfig {