Allow p2p UDP packages to set DSCP

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index 6b8884dd11479c5cdfe057d4fc2121b6e3b2a01b..d9637347eb37086003cdbc5c84b7e47fcf94a6f7 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -553,6 +553,34 @@ enum WifiPHYLayerProtocol {
 // Currently only available on OS_WIN.
 NET_EXPORT WifiPHYLayerProtocol GetWifiPHYLayerProtocol();
 
+// Differentiated Services Code Point.
+// See http://tools.ietf.org/html/rfc2474 for details.
+enum DiffServCodePoint {
+  DSCP_NO_CHANGE = -1,
+  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
+};
+
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_