Adding histograms showing fraction of page load times

net/http/http_transaction_factory.h

 // Copyright (c) 2011 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.
 
 #ifndef NET_HTTP_HTTP_TRANSACTION_FACTORY_H__
 #define NET_HTTP_HTTP_TRANSACTION_FACTORY_H__
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 class HttpCache;
 class HttpNetworkSession;
 class HttpTransaction;
-
+class HttpTransactionDelegate;
 
 // An interface to a class that can create HttpTransaction objects.
 class NET_EXPORT HttpTransactionFactory {
  public:
   virtual ~HttpTransactionFactory() {}
 
   // Creates a HttpTransaction object. On success, saves the new
   // transaction to |*trans| and returns OK.
-  virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans) = 0;
+  virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans,
+                                HttpTransactionDelegate* delegate) = 0;
 
   // Returns the associated cache if any (may be NULL).
   virtual HttpCache* GetCache() = 0;
 
   // Returns the associated HttpNetworkSession used by new transactions.
   virtual HttpNetworkSession* GetSession() = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_FACTORY_H__