Implement prefetching in chrome

net/url_request/url_request.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_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 527 matching lines @@
 
   const net::BoundNetLog& net_log() const { return net_log_; }
 
   // Returns the expected content size if available
   int64 GetExpectedContentSize() const;
 
   // Returns the priority level for this request.
   net::RequestPriority priority() const { return priority_; }
   void set_priority(net::RequestPriority priority) {
     DCHECK_GE(priority, net::HIGHEST);
-    DCHECK_LE(priority, net::LOWEST);
+    DCHECK_LT(priority, net::NUM_PRIORITIES);
     priority_ = priority;
   }
 
 #ifdef UNIT_TEST
   URLRequestJob* job() { return job_; }
 #endif
 
  protected:
   // Allow the URLRequestJob class to control the is_pending() flag.
   void set_is_pending(bool value) { is_pending_ = value; }
@@ skipping 87 matching lines @@
   // The priority level for this request.  Objects like ClientSocketPool use
   // this to determine which URLRequest to allocate sockets to first.
   net::RequestPriority priority_;
 
   base::LeakTracker<URLRequest> leak_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_