[Prerender] Restore request priorities when swapped in

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 90 matching lines @@
   // hasn't been created yet.
   static ResourceDispatcherHostImpl* Get();
 
   // ResourceDispatcherHost implementation:
   void SetDelegate(ResourceDispatcherHostDelegate* delegate) override;
   void SetAllowCrossOriginAuthPrompt(bool value) override;
   void ClearLoginDelegateForRequest(net::URLRequest* request) override;
   void RegisterInterceptor(const std::string& http_header,
                            const std::string& starts_with,
                            const InterceptorCallback& interceptor) override;
+  void ReprioritizeRequest(net::URLRequest* request,
+                           net::RequestPriority priority) override;
 
   // Puts the resource dispatcher host in an inactive state (unable to begin
   // new requests).  Cancels all pending requests.
   void Shutdown();
 
   // Force cancels any pending requests for the given |context|. This is
   // necessary to ensure that before |context| goes away, all requests
   // for it are dead.
   void CancelRequestsForContext(ResourceContext* context);
 
@@ skipping 651 matching lines @@
 
   // Task runner for the IO thead.
   scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_