Allows deferral of a URLRequest just before talking to the network, at

net/http/http_transaction_unittest.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 "net/http/http_transaction_unittest.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 394 matching lines @@
   if (net_log.net_log())
     socket_log_id_ = net_log.net_log()->NextID();
 
   if (test_mode_ & TEST_MODE_SYNC_NET_START)
     return net::OK;
 
   CallbackLater(callback, net::OK);
   return net::ERR_IO_PENDING;
 }
 
+void MockNetworkTransaction::SetBeforeNetworkStartCallback(
+    const BeforeNetworkStartCallback& callback) {
+}
+
+int MockNetworkTransaction::ResumeNetworkStart() {
+  // Should not get here.
+  return net::ERR_FAILED;
+}
+
 void MockNetworkTransaction::CallbackLater(
     const net::CompletionCallback& callback, int result) {
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&MockNetworkTransaction::RunCallback,
                             weak_factory_.GetWeakPtr(), callback, result));
 }
 
 void MockNetworkTransaction::RunCallback(
     const net::CompletionCallback& callback, int result) {
   callback.Run(result);
@@ skipping 47 matching lines @@
 
     if (rv > 0)
       content.append(buf->data(), rv);
     else if (rv < 0)
       return rv;
   } while (rv > 0);
 
   result->swap(content);
   return net::OK;
 }