Add SSL support to the GN build

build/config/crypto.gni

 # Copyright (c) 2013 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.
 
 # This file declares build flags for the SSL library configuration.
 #
 # TODO(brettw) this should probably be moved to src/crypto or somewhere, and
 # the global build dependency on it should be removed.
 
 declare_args() {
-  # Use OpenSSL instead of NSS. This is used for Android and is experimental
-  # in other cases (see http://crbug.com/62803).
-  use_openssl = false
+  # Use OpenSSL instead of NSS. This is used for Android and NaCl untrusted
+  # code, and is experimental in other cases (see http://crbug.com/62803).
+  use_openssl = is_android || is_nacl
 }
 
 if (is_linux && !use_openssl) {
   use_nss = true
 } else {
   use_nss = false
 }