Make sure message ports that are transferred to a serviceworker end up in the right process.

content/browser/service_worker/embedded_worker_instance.cc

 // Copyright 2013 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.
 
 #include "content/browser/service_worker/embedded_worker_instance.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind_helpers.h"
@@ skipping 322 matching lines @@
     const base::string16& message,
     int line_number,
     const GURL& source_url) {
   FOR_EACH_OBSERVER(
       Listener,
       listener_list_,
       OnReportConsoleMessage(
           source_identifier, message_level, message, line_number, source_url));
 }
 
+MessagePortMessageFilter* EmbeddedWorkerInstance::message_port_message_filter()
+    const {
+  return registry_->MessagePortMessageFilterForProcess(process_id_);
+}
+
 void EmbeddedWorkerInstance::AddListener(Listener* listener) {
   listener_list_.AddObserver(listener);
 }
 
 void EmbeddedWorkerInstance::RemoveListener(Listener* listener) {
   listener_list_.RemoveObserver(listener);
 }
 
 }  // namespace content