Allows prefetch requests to live beyond the renderer by delaying

content/browser/loader/resource_loader.h

Index: content/browser/loader/resource_loader.h
diff --git a/content/browser/loader/resource_loader.h b/content/browser/loader/resource_loader.h
index 6a611a723f5815b8a29fe9984552003b38f9b25a..1052b8f9c7d6eab06eecc9d2534e953bd402eb56 100644
--- a/content/browser/loader/resource_loader.h
+++ b/content/browser/loader/resource_loader.h
@@ -8,6 +8,7 @@
 #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"
@@ -39,6 +40,10 @@ class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
   void StartRequest();
   void CancelRequest(bool from_renderer);
 
+  // Sets the resource as detached and starts a timer to cancel the request in
+  // the future.
+  void Detach();
+
   void ReportUploadProgress();
 
   bool is_transferring() const { return is_transferring_; }
@@ -54,6 +59,10 @@ class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
   // IPC message handlers:
   void OnUploadProgressACK();
 
+  void set_detachable_delay_ms(int delay) {
+    detachable_delay_on_cancel_ms_ = delay;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceLoaderTest, ClientCertStoreLookup);
 
@@ -97,6 +106,7 @@ class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
 
   void StartRequestInternal();
   void CancelRequestInternal(int error, bool from_renderer);
+
   void CompleteResponseStarted();
   void StartReading(bool is_continuation);
   void ResumeReading();
@@ -133,6 +143,10 @@ class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
   // which point we'll receive a new ResourceHandler.
   bool is_transferring_;
 
+  int detachable_delay_on_cancel_ms_;
+
+  scoped_ptr<base::OneShotTimer<ResourceLoader> > detached_timer_;
+
   scoped_ptr<net::ClientCertStore> client_cert_store_;
 
   base::WeakPtrFactory<ResourceLoader> weak_ptr_factory_;