Merge 53487 - [Linux] Enable connecting to localhost when offline....

net/base/address_family.h

 // Copyright (c) 2010 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_ADDRESS_FAMILY_H_
 #define NET_BASE_ADDRESS_FAMILY_H_
 
 namespace net {
 
 // Enum wrapper around the address family types supported by host resolver
 // procedures.
 enum AddressFamily {
   ADDRESS_FAMILY_UNSPECIFIED,   // AF_UNSPEC
   ADDRESS_FAMILY_IPV4,          // AF_INET
   ADDRESS_FAMILY_IPV6,          // AF_INET6
 };
 
-// HostResolverFlags is a bitflag enum wrapper around the addrinfo.ai_flags
-// supported by host resolver procedures.
+// HostResolverFlags is a bitflag enum used by host resolver procedures to
+// determine the value of addrinfo.ai_flags.
 enum {
-  HOST_RESOLVER_CANONNAME = 1 << 0,  // 0x1, AI_CANONNAME
+  HOST_RESOLVER_CANONNAME = 1 << 0,  // AI_CANONNAME
+  // Hint to the resolver proc that only loopback addresses are configured.
+  HOST_RESOLVER_LOOPBACK_ONLY = 1 << 1,
 };
 typedef int HostResolverFlags;
 
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_FAMILY_H_