(mostly) working wtf / wtf_unittests gn targets

tools/gn/secondary/testing/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.
 
 # TODO(brettw) move to testing/gtest/BUILD.gn
 config("gtest_config") {
   defines = [ "UNIT_TEST" ]
   include_dirs = [ "gtest/include" ]  # Gtest headers need to be able to find themselves.
   if (is_win) {
     cflags = [ "/wd4800" ]  # Unused variable warning.
@@ skipping 30 matching lines @@
     "gtest/src/gtest-port.cc",
     "gtest/src/gtest-printers.cc",
     "gtest/src/gtest-test-part.cc",
     "gtest/src/gtest-typed-test.cc",
     "gtest/src/gtest.cc",
     "multiprocess_func_list.cc",
     "multiprocess_func_list.h",
     "platform_test.h",
   ]
 
+    if (is_mac) {
+      sources += [
+        "gtest_mac.h",
+        "gtest_mac.mm",
+        "platform_test_mac.mm",
+      ]
+    }
+
   include_dirs = [ "gtest" ]
   direct_dependent_configs = [ ":gtest_config" ]
+
+  configs -= "//build/config/compiler:chromium_code"
+  configs += "//build/config/compiler:no_chromium_code"
 }
 
 # TODO(brettw) move to testing/gmock/BUILD.gn
 config("gmock_config") {
   # Gmock headers need to be able to find themselves.
   include_dirs = [ "gmock/include" ]
 }
 
 # TODO(brettw) move to testing/gmock/BUILD.gn
 static_library("gmock") {
@@ skipping 29 matching lines @@
     "//testing:gtest_config",
   ]
 }
 
 # TODO(brettw) move to testing/gmock/BUILD.gn
 static_library("gmock_main") {
   external = true
   sources = [ "src/gmock_main.cc" ]
   deps = [ ":gmock" ]
 }