Add DTLS support to NSS, contributed by Eric Rescorla.

net/third_party/nss/ssl.gyp

 # 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.
 
 {
   'conditions': [
     [ 'os_posix == 1 and OS != "mac"', {
       'conditions': [
         ['sysroot!=""', {
           'variables': {
             'pkg-config': '../../../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
           },
         }, {
           'variables': {
             'pkg-config': 'pkg-config'
           },
         }],
       ],
     }],
   ],
 
   'targets': [
     {
       'target_name': 'libssl',
       'type': 'static_library',
       'sources': [
         'ssl/authcert.c',
         'ssl/cmpcert.c',
         'ssl/derive.c',
+        'ssl/dtls1con.c',
         'ssl/nsskea.c',
         'ssl/os2_err.c',
         'ssl/os2_err.h',
         'ssl/preenc.h',
         'ssl/prelib.c',
         'ssl/ssl.h',
         'ssl/ssl3con.c',
         'ssl/ssl3ecc.c',
         'ssl/ssl3ext.c',
         'ssl/ssl3gthr.c',
@@ skipping 114 matching lines @@
       'configurations': {
         'Debug_Base': {
           'defines': [
             'DEBUG',
           ],
         },
       },
     },
   ],
 }