Apply automatic range checking for enums across p2p_messages IPC.

net/base/net_util.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 NET_BASE_NET_UTIL_H_
 #define NET_BASE_NET_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 556 matching lines @@
 unsigned CommonPrefixLength(const IPAddressNumber& a1,
                             const IPAddressNumber& a2);
 
 // Computes the number of leading 1-bits in |mask|.
 unsigned MaskPrefixLength(const IPAddressNumber& mask);
 
 // Differentiated Services Code Point.
 // See http://tools.ietf.org/html/rfc2474 for details.
 enum DiffServCodePoint {
   DSCP_NO_CHANGE = -1,
+  DSCP_FIRST = DSCP_NO_CHANGE,
   DSCP_DEFAULT = 0,  // Same as DSCP_CS0
   DSCP_CS0  = 0,   // The default
   DSCP_CS1  = 8,   // Bulk/background traffic
   DSCP_AF11 = 10,
   DSCP_AF12 = 12,
   DSCP_AF13 = 14,
   DSCP_CS2  = 16,
   DSCP_AF21 = 18,
   DSCP_AF22 = 20,
   DSCP_AF23 = 22,
   DSCP_CS3  = 24,
   DSCP_AF31 = 26,
   DSCP_AF32 = 28,
   DSCP_AF33 = 30,
   DSCP_CS4  = 32,
   DSCP_AF41 = 34,  // Video
   DSCP_AF42 = 36,  // Video
   DSCP_AF43 = 38,  // Video
   DSCP_CS5  = 40,  // Video
   DSCP_EF   = 46,  // Voice
   DSCP_CS6  = 48,  // Voice
   DSCP_CS7  = 56,  // Control messages
+  DSCP_LAST = DSCP_CS7
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_