Log the QUIC priority when sending requests.

net/quic/quic_http_utils.cc

 // Copyright 2013 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.
 
 #include "net/quic/quic_http_utils.h"
 
 namespace net {
 
 QuicPriority ConvertRequestPriorityToQuicPriority(
     const RequestPriority priority) {
   DCHECK_GE(priority, MINIMUM_PRIORITY);
   DCHECK_LE(priority, MAXIMUM_PRIORITY);
   return static_cast<QuicPriority>(HIGHEST - priority);
 }
 
 NET_EXPORT_PRIVATE RequestPriority ConvertQuicPriorityToRequestPriority(
     QuicPriority priority) {
   // Handle invalid values gracefully.
   return (priority >= 5) ?
       IDLE : static_cast<RequestPriority>(HIGHEST - priority);
 }
 
+base::Value* QuicRequestNetLogCallback(
+    const SpdyHeaderBlock* headers,
+    QuicPriority priority,
+    NetLog::LogLevel log_level) {
+  base::DictionaryValue* dict = static_cast<base::DictionaryValue*>(
+      SpdyHeaderBlockNetLogCallback(headers, log_level));
+  dict->SetInteger("quic_priority", static_cast<int>(priority));
+  return dict;
+}
+
 }  // namespace net