TrafficClass

This enum may be extended in the future. NOTE: If you modify or add enums here, be sure to update //java/com/google/net/base/TrafficClassComparator.java and //net/base/google_iptos.h. WARNING: DO NOT write code that depends on this enum not growing, unless you explicitly want your code to fail compilation, or your tests to fail, when a new enum member is added. Things that you don't want to do include: 1. Using TrafficClass variable as a switch variable, without supplying a default case. 2. Supplying a default case, but doing LOG(FATAL) there. 3. Generating protobufs, that contain entries for each of the enum's members, then comparing the generated protobufs against a golden copy (the new members will not be present in the golden, and the comparison will fail).