Allows prefetch requests to live beyond the renderer by delaying

content/browser/loader/resource_loader.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.
 
 #ifndef CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
 #define CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/ssl/ssl_error_handler.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/resource_controller.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
 class ClientCertStore;
 }
 
@@ skipping 26 matching lines @@
 
   net::URLRequest* request() { return request_.get(); }
   ResourceRequestInfoImpl* GetRequestInfo();
 
   void ClearLoginDelegate();
   void ClearSSLClientAuthHandler();
 
   // IPC message handlers:
   void OnUploadProgressACK();
 
+  static void set_delay_prefetch_cancel_ms(int cancel_ms) {
+    ResourceLoader::delay_prefetch_cancel_ms_ = cancel_ms;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceLoaderTest, ClientCertStoreLookup);
 
   ResourceLoader(scoped_ptr<net::URLRequest> request,
                  scoped_ptr<ResourceHandler> handler,
                  ResourceLoaderDelegate* delegate,
                  scoped_ptr<net::ClientCertStore> client_cert_store);
 
   // Initialization logic shared between the public and private constructor.
   void Init(scoped_ptr<net::URLRequest> request,
@@ skipping 59 matching lines @@
   uint64 last_upload_position_;
   bool waiting_for_upload_progress_ack_;
   base::TimeTicks last_upload_ticks_;
   base::TimeTicks read_deferral_start_time_;
 
   // Indicates that we are in a state of being transferred to a new downstream
   // consumer.  We are waiting for a notification to complete the transfer, at
   // which point we'll receive a new ResourceHandler.
   bool is_transferring_;
 
+  scoped_ptr<base::OneShotTimer<ResourceLoader> > prefetch_timer_;
+
   scoped_ptr<net::ClientCertStore> client_cert_store_;
 
   base::WeakPtrFactory<ResourceLoader> weak_ptr_factory_;
 
+  // The time in ms to delay a cancel of a prefetch.
+  static int delay_prefetch_cancel_ms_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceLoader);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_