Media Session: passing metadata from renderer/ to browser/.

content/common/media/media_session_messages_android.h

Index: content/common/media/media_session_messages_android.h
diff --git a/content/common/media/media_session_messages_android.h b/content/common/media/media_session_messages_android.h
index 18a63844d70e9c4077135f5f1881fe2785a154cf..266ee273bcf197027cff8b4ed45332254a4eda48 100644
--- a/content/common/media/media_session_messages_android.h
+++ b/content/common/media/media_session_messages_android.h
@@ -7,12 +7,19 @@
 
 #include "content/common/android/gin_java_bridge_errors.h"
 #include "content/common/content_export.h"
+#include "content/public/common/media_metadata.h"
 #include "ipc/ipc_message_macros.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 #define IPC_MESSAGE_START MediaSessionMsgStart
 
+IPC_STRUCT_TRAITS_BEGIN(content::MediaMetadata)
+  IPC_STRUCT_TRAITS_MEMBER(title)
+  IPC_STRUCT_TRAITS_MEMBER(artist)
+  IPC_STRUCT_TRAITS_MEMBER(album)
+IPC_STRUCT_TRAITS_END()
+
 // Messages for notifying the render process of media session status -------
 
 IPC_MESSAGE_ROUTED2(MediaSessionMsg_DidActivate,
@@ -30,3 +37,7 @@ IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_Activate,
 IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_Deactivate,
                     int /* session_id */,
                     int /* request_id */)
+
+IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_SetMetadata,
+                    int /* request_id*/,
+                    content::MediaMetadata /* metadata */)