Implement the close() API for Message ports

content/public/browser/message_port_provider.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_PROVIDER_H_
 #define CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_PROVIDER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 29 matching lines @@
   // to the message port numbers.
   static void CreateMessageChannel(MessagePortDelegate* delegate,
                                    int* port1,
                                    int* port2);
 
   // Posts a MessageEvent to a message port associated with a message channel.
   static void PostMessageToPort(int sender_port_id,
                                 const base::string16& data,
                                 const std::vector<int>& sent_ports);
 
+  // Close the message port. Should be called on IO thread.
+  static void ClosePort(int message_port_id);
+
   // Cleanup the message ports that belong to the closing delegate.
   static void OnMessagePortDelegateClosing(MessagePortDelegate * delegate);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePortProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_PROVIDER_H_