Starting work on full 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.
-#
-# PLEASE TRY TO AVOID ADDING FLAGS TO THIS FILE in cases where grit isn't
-# required. See the declare_args block of BUILDCONFIG.gn for advice on how
-# to set up feature flags.
-
-declare_args() {
-  # Use OpenSSL instead of NSS. This is used for all platforms but iOS. (See
-  # http://crbug.com/338886).
-  use_openssl = !is_ios
-}
-
-# True when we're using OpenSSL for representing certificates. When targeting
-# Android, the platform certificate library is used for certificate
-# verification. On other targets, this flag also enables OpenSSL for certificate
-# verification, but this configuration is unsupported.
-use_openssl_certs = is_android
-
-# True if NSS is used for certificate verification. Note that this is
-# independent from use_openssl. It is possible to use OpenSSL for the crypto
-# library, but NSS for the platform certificate library.
-use_nss_certs = false