Add a force pipelining option to load flags.

chrome/browser/net/http_pipelining_compatibility_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_HTTP_PIPELINING_COMPATIBILITY_CLIENT_H_
 #define CHROME_BROWSER_NET_HTTP_PIPELINING_COMPATIBILITY_CLIENT_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
 #include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
 
 namespace chrome_browser_net {
 
 // Class for performing a background test of users' Internet connections.
 // Fetches a collection of resources on a test server and verifies all were
 // received correctly. This will be used to determine whether or not proxies are
 // interfering with a user's ability to use HTTP pipelining. Results are
 // recorded with UMA.
 //
 // TODO(simonjam): Connect this to something. We should start with a field trial
@@ skipping 85 matching lines @@
 
   // Called when a Request determines its HTTP response code. Reports to UMA.
   void ReportResponseCode(int request_id, int response_code);
 
   // Returns the full UMA metric name based on |request_id| and |description|.
   std::string GetMetricName(int request_id, const char* description);
 
   ScopedVector<Request> requests_;
   net::CompletionCallback finished_callback_;
   size_t num_finished_;
+  scoped_ptr<net::HttpTransactionFactory> http_transaction_factory_;
+  scoped_refptr<net::URLRequestContext> url_request_context_;
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_HTTP_PIPELINING_COMPATIBILITY_CLIENT_H_