Allows prefetch requests to live beyond the renderer by delaying

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 220 matching lines @@
   // Called by a ResourceHandler after it has finished its request and is done
   // using its shared memory buffer. Frees up that file descriptor to be used
   // elsewhere.
   void FinishedWithResourcesForRequest(const net::URLRequest* request_);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            TestBlockedRequestsProcessDies);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            CalculateApproximateMemoryCost);
+  FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
+                           DetachableResourceTimesOut);
+  FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
+                           TestProcessCancelDetachableTimesOut);
 
   class ShutdownTask;
 
   struct OustandingRequestsStats {
     int memory_cost;
     int num_requests;
   };
 
   friend class ShutdownTask;
   friend class ResourceMessageDelegate;
@@ skipping 254 matching lines @@
   typedef std::map<GlobalRoutingID, OfflinePolicy*> OfflineMap;
 
   OfflineMap offline_policy_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_