Enable setting deferral state on ResourceDispatcher at request start

content/child/resource_dispatcher.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #ifndef CONTENT_CHILD_RESOURCE_DISPATCHER_H_
 #define CONTENT_CHILD_RESOURCE_DISPATCHER_H_
 
 #include <stdint.h>
@@ skipping 69 matching lines @@
 
   // Removes a request from the |pending_requests_| list, returning true if the
   // request was found and removed.
   bool RemovePendingRequest(int request_id);
 
   // Cancels a request in the |pending_requests_| list.  The request will be
   // removed from the dispatcher as well.
   virtual void Cancel(int request_id);
 
   // Toggles the is_deferred attribute for the specified request.
-  void SetDefersLoading(int request_id, bool value);
+  virtual void SetDefersLoading(int request_id, bool value);
 
   // Indicates the priority of the specified request changed.
   void DidChangePriority(int request_id,
                          net::RequestPriority new_priority,
                          int intra_priority_value);
 
   void set_message_sender(IPC::Sender* sender) {
     DCHECK(sender);
     DCHECK(pending_requests_.empty());
     message_sender_ = sender;
@@ skipping 141 matching lines @@
   scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter_;
 
   base::WeakPtrFactory<ResourceDispatcher> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_RESOURCE_DISPATCHER_H_