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

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 841 matching lines @@
     // As the unhandled resource message effectively has no consumer, mark it as
     // handled to prevent needless propagation through the filter pipeline.
     handled = true;
   }
 
   filter_ = NULL;
   return handled;
 }
 
 void ResourceDispatcherHostImpl::OnRequestResource(
-    const IPC::Message& message,
+    int routing_id,
     int request_id,
     const ResourceHostMsg_Request& request_data) {
-  BeginRequest(request_id, request_data, NULL, message.routing_id());
+  BeginRequest(request_id, request_data, NULL, routing_id);
 }
 
 // Begins a resource request with the given params on behalf of the specified
 // child process.  Responses will be dispatched through the given receiver. The
 // process ID is used to lookup WebContentsImpl from routing_id's in the case of
 // a request from a renderer.  request_context is the cookie/cache context to be
 // used for this request.
 //
 // If sync_result is non-null, then a SyncLoad reply will be generated, else
 // a normal asynchronous set of response messages will be generated.
@@ skipping 1097 matching lines @@
   if ((load_flags & net::LOAD_REPORT_RAW_HEADERS)
       && !policy->CanReadRawCookies(child_id)) {
     VLOG(1) << "Denied unauthorized request for raw headers";
     load_flags &= ~net::LOAD_REPORT_RAW_HEADERS;
   }
 
   return load_flags;
 }
 
 }  // namespace content