stale-while-revalidate experimental implementation.

chrome/browser/net/chrome_network_delegate.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 "chrome/browser/net/chrome_network_delegate.h"
 
 #include <stdlib.h>
 
 #include <vector>
 
@@ skipping 552 matching lines @@
 
     if (!request->was_cached() &&         // Don't record cached content
         received_content_length &&        // Zero-byte responses aren't useful.
         (is_http || is_https)) {          // Only record for HTTP or HTTPS urls.
       int64 original_content_length =
           request->response_info().headers->GetInt64HeaderValue(
               "x-original-content-length");
       data_reduction_proxy::DataReductionProxyRequestType request_type =
           data_reduction_proxy::GetDataReductionProxyRequestType(request);
 
-      base::TimeDelta freshness_lifetime =
-          request->response_info().headers->GetFreshnessLifetime(
-              request->response_info().response_time);
+      base::TimeDelta freshness_lifetime;
+      request->response_info().headers->GetFreshnessLifetime(
+          request->response_info().response_time, &freshness_lifetime);
       int64 adjusted_original_content_length =
           data_reduction_proxy::GetAdjustedOriginalContentLength(
               request_type, original_content_length,
               received_content_length);
       AccumulateContentLength(received_content_length,
                               adjusted_original_content_length,
                               request_type);
       RecordContentLengthHistograms(received_content_length,
                                     original_content_length,
                                     freshness_lifetime);
@@ skipping 231 matching lines @@
     data_reduction_proxy::DataReductionProxyRequestType request_type) {
   DCHECK_GE(received_content_length, 0);
   DCHECK_GE(original_content_length, 0);
   StoreAccumulatedContentLength(received_content_length,
                                 original_content_length,
                                 request_type,
                                 reinterpret_cast<Profile*>(profile_));
   received_content_length_ += received_content_length;
   original_content_length_ += original_content_length;
 }