Implement exponential back-off mechanism.

net/url_request/url_request_http_job.h

 // Copyright (c) 2010 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_HTTP_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "net/base/auth.h"
 #include "net/base/completion_callback.h"
 #include "net/http/http_request_info.h"
 #include "net/url_request/url_request_job.h"
+#include "net/url_request/url_request_throttler_entry_interface.h"
 
 namespace net {
 class HttpResponseInfo;
 class HttpTransaction;
 }
 class URLRequestContext;
 
 // A URLRequestJob subclass that is built on top of HttpTransaction.  It
 // provides an implementation for both HTTP and HTTPS.
 class URLRequestHttpJob : public URLRequestJob {
@@ skipping 77 matching lines @@
   net::CompletionCallbackImpl<URLRequestHttpJob> start_callback_;
   net::CompletionCallbackImpl<URLRequestHttpJob> read_callback_;
 
   bool read_in_progress_;
 
   // An URL for an SDCH dictionary as suggested in a Get-Dictionary HTTP header.
   GURL sdch_dictionary_url_;
 
   scoped_ptr<net::HttpTransaction> transaction_;
 
+  // This is used to supervise traffic and enforce exponential back-off.
+  scoped_refptr<net::URLRequestThrottlerEntryInterface> throttling_entry_;
+
   // Indicated if an SDCH dictionary was advertised, and hence an SDCH
   // compressed response is expected.  We use this to help detect (accidental?)
   // proxy corruption of a response, which sometimes marks SDCH content as
   // having no content encoding <oops>.
   bool sdch_dictionary_advertised_;
 
   // For SDCH latency experiments, when we are able to do SDCH, we may enable
   // either an SDCH latency test xor a pass through test.  The following bools
   // indicate what we decided on for this instance.
   bool sdch_test_activated_;  // Advertising a dictionary for sdch.
   bool sdch_test_control_;    // Not even accepting-content sdch.
 
   // For recording of stats, we need to remember if this is cached content.
   bool is_cached_content_;
 
  private:
   virtual ~URLRequestHttpJob();
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_