Plumb ConnectionAttempts from HttpNetworkTransaction to URLRequest.

net/url_request/url_request_job.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 NET_URL_REQUEST_URL_REQUEST_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_JOB_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_observer.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/base/upload_progress.h"
 #include "net/cookies/canonical_cookie.h"
+#include "net/socket/connection_attempts.h"
 #include "net/url_request/redirect_info.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
 namespace net {
 
 class AuthChallengeInfo;
 class AuthCredentials;
 class CookieOptions;
 class Filter;
@@ skipping 187 matching lines @@
   // base::PowerObserver methods:
   // We invoke URLRequestJob::Kill on suspend (crbug.com/4606).
   void OnSuspend() override;
 
   // Called after a NetworkDelegate has been informed that the URLRequest
   // will be destroyed. This is used to track that no pending callbacks
   // exist at destruction time of the URLRequestJob, unless they have been
   // canceled by an explicit NetworkDelegate::NotifyURLRequestDestroyed() call.
   virtual void NotifyURLRequestDestroyed();
 
+  // Populates |out| with the vector of connection attempts made at the socket
+  // layer in the course of executing the URLRequestJob. Should be called after
+  // the response has been sent or after the connection has failed.

[Randy Smith (Not in Mondays), 2015/05/11 20:59:31]

"response has been sent".  Do you mean "response has been received" or "request
has been sent"?  On the client side, I'm not sure what "response has been sent"
means.

+  virtual void GetConnectionAttempts(ConnectionAttempts* out) const;
+
   // Given |policy|, |referrer|, and |redirect_destination|, returns the
   // referrer URL mandated by |request|'s referrer policy.
   static GURL ComputeReferrerForRedirect(URLRequest::ReferrerPolicy policy,
                                          const std::string& referrer,
                                          const GURL& redirect_destination);
 
  protected:
   friend class base::RefCounted<URLRequestJob>;
   ~URLRequestJob() override;
 
@@ skipping 190 matching lines @@
   NetworkDelegate* network_delegate_;
 
   base::WeakPtrFactory<URLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_