Step two of optionally sending messages to/from message ports as base::Value.

content/browser/message_port_service.h

Index: content/browser/message_port_service.h
diff --git a/content/browser/message_port_service.h b/content/browser/message_port_service.h
index 1e561b2acab729a4f3bc8067510dba36ccecf0f3..d5e3379d57d7eb724bb937b7b57ef13e51e761c2 100644
--- a/content/browser/message_port_service.h
+++ b/content/browser/message_port_service.h
@@ -21,7 +21,8 @@ class MessagePortDelegate;
 
 class CONTENT_EXPORT MessagePortService {
  public:
-  typedef std::vector<std::pair<content::MessagePortMessage, std::vector<int>>>
+  typedef std::vector<std::pair<content::MessagePortMessage,
+                                std::vector<TransferredMessagePort>>>
       QueuedMessages;
 
   // Returns the MessagePortService singleton.
@@ -33,9 +34,10 @@ class CONTENT_EXPORT MessagePortService {
               int* message_port_id);
   void Destroy(int message_port_id);
   void Entangle(int local_message_port_id, int remote_message_port_id);
-  void PostMessage(int sender_message_port_id,
-                   const MessagePortMessage& message,
-                   const std::vector<int>& sent_message_port_ids);
+  void PostMessage(
+      int sender_message_port_id,
+      const MessagePortMessage& message,
+      const std::vector<TransferredMessagePort>& sent_message_ports);
   void QueueMessages(int message_port_id);
   void SendQueuedMessages(int message_port_id,
                           const QueuedMessages& queued_messages);
@@ -72,9 +74,10 @@ class CONTENT_EXPORT MessagePortService {
   MessagePortService();
   ~MessagePortService();
 
-  void PostMessageTo(int message_port_id,
-                     const MessagePortMessage& message,
-                     const std::vector<int>& sent_message_port_ids);
+  void PostMessageTo(
+      int message_port_id,
+      const MessagePortMessage& message,
+      const std::vector<TransferredMessagePort>& sent_message_ports);
 
   // Handles the details of removing a message port id. Before calling this,
   // verify that the message port id exists.