Use filter context to track stats better in SDCH filtering

net/url_request/url_request_job_metrics.h

 // Copyright (c) 2006-2008 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.
 
 // Records IO statistics associated with a URLRequestJob.
 // See description in navigation_profiler.h for an overview of perf profiling.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_JOB_METRICS_H_
 #define NET_URL_REQUEST_URL_REQUEST_JOB_METRICS_H_
 
@@ skipping 16 matching lines @@
   // original url, url_ is empty.
   scoped_ptr<GURL> url_;
 
   // Time when the job starts.
   base::TimeTicks start_time_;
 
   // Time when the job is done.
   base::TimeTicks end_time_;
 
   // Total number of bytes the job reads from underline IO.
-  int total_bytes_read_;
+  int64 total_bytes_read_;
 
   // Number of IO read operations the job issues.
   int number_of_read_IO_;
 
   // Final status of the job.
   bool success_;
 
   // Append the text report of the frame loading to the input string.
   void AppendText(std::wstring* text);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_METRICS_H_