[Net] Propagate priority changes from URLRequest to HttpTransaction

net/http/http_request_info.h

 // Copyright (c) 2011 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 NET_HTTP_HTTP_REQUEST_INFO_H__
 #define NET_HTTP_HTTP_REQUEST_INFO_H__
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 29 matching lines @@
   // Any extra request headers (including User-Agent).
   HttpRequestHeaders extra_headers;
 
   // Any upload data.
   UploadDataStream* upload_data_stream;
 
   // Any load flags (see load_flags.h).
   int load_flags;
 
   // The priority level for this request.
+  // TODO(akalin): Remove this from this struct, since |priority| can
+  // change during the lifetime of a request.
   RequestPriority priority;
 
   // The motivation behind this request.
   RequestMotivation motivation;
 
   // An optional globally unique identifier for this request for use by the
   // consumer. 0 is invalid.
   uint64 request_id;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_REQUEST_INFO_H__