Add convenience HighestPriority and LowestPriority methods to QuicUtils.

net/quic/quic_data_stream.cc

 // 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.
 
 #include "net/quic/quic_data_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/quic_session.h"
 #include "net/quic/quic_spdy_decompressor.h"
 #include "net/spdy/write_blocked_list.h"
@@ skipping 290 matching lines @@
 
   if (!priority_parsed_ && session()->connection()->is_server()) {
     QuicPriority temporary_priority = priority_;
     total_bytes_parsed = StripUint32(
         data, data_len, &headers_id_and_priority_buffer_, &temporary_priority);
     if (total_bytes_parsed > 0 && headers_id_and_priority_buffer_.size() == 0) {
       priority_parsed_ = true;
 
       // Spdy priorities are inverted, so the highest numerical value is the
       // lowest legal priority.
-      if (temporary_priority > static_cast<QuicPriority>(kLowestPriority)) {
+      if (temporary_priority > QuicUtils::LowestPriority()) {
         session()->connection()->SendConnectionClose(QUIC_INVALID_PRIORITY);
         return 0;
       }
       priority_ = temporary_priority;
     }
     data += total_bytes_parsed;
     data_len -= total_bytes_parsed;
   }
   if (data_len > 0 && headers_id_ == 0u) {
     // The headers ID has not yet been read.  Strip it from the beginning of
     // the data stream.
     total_bytes_parsed += StripUint32(
         data, data_len, &headers_id_and_priority_buffer_, &headers_id_);
   }
   return total_bytes_parsed;
 }
 
 bool QuicDataStream::FinishedReadingHeaders() {
   return headers_decompressed_ && decompressed_headers_.empty();
 }
 
 }  // namespace net