Implement the close() API for Message ports

android_webview/browser/aw_message_port_service.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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_AW_MESSAGE_PORT_SERVICE_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_MESSAGE_PORT_SERVICE_H_
 
 #include <vector>
 
 #include "base/values.h"
 
 namespace android_webview {
 
 class AwMessagePortMessageFilter;
 
 // The interface for AwMessagePortService
 class AwMessagePortService  {
  public:
   virtual ~AwMessagePortService() { }
 
   virtual void OnConvertedWebToAppMessage(
       int message_port_id,
       const base::ListValue& message,
       const std::vector<int>& sent_message_port_ids) = 0;
 
   virtual void OnMessagePortMessageFilterClosing(
       AwMessagePortMessageFilter* filter) = 0;
+
+  virtual void CleanupPort(int message_port_id) = 0;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_MESSAGE_PORT_SERVICE_H_