Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

content/browser/worker_host/worker_process_host.cc

 // Copyright (c) 2012 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/worker_host/worker_process_host.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 492 matching lines @@
   else
     RecordAction(base::UserMetricsAction("WorkerProcess_BadProcessToKill"));
 }
 
 void WorkerProcessHost::RelayMessage(
     const IPC::Message& message,
     WorkerMessageFilter* incoming_filter,
     WorkerInstance* instance) {
   if (message.type() == WorkerMsg_Connect::ID) {
     // Crack the SharedWorker Connect message to setup routing for the port.
-    int sent_message_port_id;
-    int new_routing_id;
-    if (!WorkerMsg_Connect::Read(
-            &message, &sent_message_port_id, &new_routing_id)) {
+    WorkerMsg_Connect::Param params;
+    if (!WorkerMsg_Connect::Read(&message, &params))
       return;
-    }
+
+    int sent_message_port_id = params.a;
+    int new_routing_id = params.b;
     new_routing_id = worker_message_filter_->GetNextRoutingID();
     MessagePortService::GetInstance()->UpdateMessagePort(
         sent_message_port_id,
         worker_message_filter_->message_port_message_filter(),
         new_routing_id);
 
     instance->SetMessagePortID(incoming_filter,
                                message.routing_id(),
                                sent_message_port_id);
     // Resend the message with the new routing id.
@@ skipping 299 matching lines @@
   return false;
 }
 
 WorkerProcessHost::WorkerInstance::FilterInfo
 WorkerProcessHost::WorkerInstance::GetFilter() const {
   DCHECK(NumFilters() == 1);
   return *filters_.begin();
 }
 
 }  // namespace content