[Prerender] Restore request priorities when swapped in

content/public/browser/resource_dispatcher_host.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_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
+#include "net/base/request_priority.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 
 class ResourceContext;
 class ResourceDispatcherHostDelegate;
 
@@ skipping 52 matching lines @@
   // The |starts_with| parameter is used to match the prefix of the
   // |http_header| in the response and the interceptor will be invoked if there
   // is a match. If the |starts_with| parameter is empty, the interceptor will
   // be invoked for every occurrence of the |http_header|.
   // Currently only HTTP header based interceptors are supported.
   // At the moment we only support one interceptor per |http_header|.
   virtual void RegisterInterceptor(const std::string& http_header,
                                    const std::string& starts_with,
                                    const InterceptorCallback& interceptor) = 0;
 
+  // Updates the priority for |request|. Modifies request->priority(), and may
+  // start the request loading if it wasn't already started.
+  virtual void ReprioritizeRequest(net::URLRequest* request,
+                                   net::RequestPriority priority) = 0;
+
  protected:
   virtual ~ResourceDispatcherHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_