Implement TLS client auth in the OS X OpenSSL port.

net/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//url/config.gni")
 
 # TODO(cjhopman): //build/config/android/rules.gni also imports grit_rule.gni.
@@ skipping 252 matching lines @@
       "quic/crypto/aead_base_decrypter_openssl.cc",
       "quic/crypto/aead_base_encrypter_openssl.cc",
       "quic/crypto/aes_128_gcm_12_decrypter_openssl.cc",
       "quic/crypto/aes_128_gcm_12_encrypter_openssl.cc",
       "quic/crypto/chacha20_poly1305_decrypter_openssl.cc",
       "quic/crypto/chacha20_poly1305_encrypter_openssl.cc",
       "quic/crypto/channel_id_openssl.cc",
       "quic/crypto/p256_key_exchange_openssl.cc",
       "quic/crypto/scoped_evp_aead_ctx.cc",
       "quic/crypto/scoped_evp_aead_ctx.h",
-      "socket/openssl_ssl_util.cc",
-      "socket/openssl_ssl_util.h",
       "socket/ssl_client_socket_openssl.cc",
       "socket/ssl_client_socket_openssl.h",
       "socket/ssl_server_socket_openssl.cc",
       "socket/ssl_server_socket_openssl.h",
       "socket/ssl_session_cache_openssl.cc",
       "socket/ssl_session_cache_openssl.h",
+      "ssl/openssl_platform_key.h",
+      "ssl/openssl_ssl_util.cc",
+      "ssl/openssl_ssl_util.h",
     ]
+    if (is_mac) {
+      sources -= [
+        "ssl/openssl_platform_key_mac.cc",
+      ]
+    }
+    if (is_win) {
+      sources -= [
+        "ssl/openssl_platform_key_win.cc",
+      ]
+    }
   }
 
   if (!use_openssl_certs) {
     sources -= [
       "base/openssl_private_key_store.h",
       "base/openssl_private_key_store_memory.cc",
       "cert/cert_database_openssl.cc",
       "cert/cert_verify_proc_openssl.cc",
       "cert/cert_verify_proc_openssl.h",
       "cert/test_root_certs_openssl.cc",
@@ skipping 1044 matching lines @@
   sources = [ "quic/quic_server_bin.cc" ]
   deps = [
     ":quic_tools",
     ":net",
     "//base",
     "//third_party/boringssl",
   ]
 }
 
 }  # !is_android