Add a dummy variable to ResourceMsg_DataReceived.

content/child/resource_dispatcher.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/child/resource_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 195 matching lines @@
     base::SharedMemoryHandle shm_handle_copy = shm_handle;
     base::debug::Alias(&shm_handle_copy);
 
     CrashOnMapFailure();
     return;
   }
 
   request_info->buffer_size = shm_size;
 }
 
+// TODO(erikchen): This dummy variable is temporary and is only intended to be
+// present for one Canary release. http://crbug.com/527588.
 void ResourceDispatcher::OnReceivedData(int request_id,
+                                        int /* dummy variable */,
                                         int data_offset,
                                         int data_length,
                                         int encoded_data_length) {
   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedData");
   DCHECK_GT(data_length, 0);
   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
   bool send_ack = true;
   if (request_info && data_length > 0) {
     // TODO(erikchen): Temporary code to help track http://crbug.com/527588.
     int buffer_size = request_info->buffer_size;
@@ skipping 571 matching lines @@
       extra_data->transferred_request_request_id();
   request->service_worker_provider_id =
       extra_data->service_worker_provider_id();
   request->request_body = request_body;
   if (frame_origin)
     *frame_origin = extra_data->frame_origin();
   return request.Pass();
 }
 
 }  // namespace content