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

content/common/media/media_session_messages_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for the Media Session API.
 // Multiply-included message file, hence no include guard.
 
 #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,
                     int /* request_id */,
                     bool /* success */)
 
 IPC_MESSAGE_ROUTED1(MediaSessionMsg_DidDeactivate, int /* request_id */)
 
 // Messages for controlling the media session in browser process ----------
 
 IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_Activate,
                     int /* session_id */,
                     int /* request_id */)
 
 IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_Deactivate,
                     int /* session_id */,
                     int /* request_id */)
+
+IPC_MESSAGE_ROUTED2(MediaSessionHostMsg_SetMetadata,
+                    int /* request_id*/,
+                    content::MediaMetadata /* metadata */)