Enable the -Wundef warning for clang

webrtc/test/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 import("//build/config/ui.gni")
@@ skipping 88 matching lines @@
     "../system_wrappers:metrics_default",
     "//testing/gtest",
     "//third_party/gflags",
   ]
 }
 
 rtc_source_set("test_support") {
   testonly = true
 
   sources = [
+    "gmock.h",
+    "gtest.h",
     "testsupport/fileutils.cc",
     "testsupport/fileutils.h",
     "testsupport/frame_reader.cc",
     "testsupport/frame_reader.h",
     "testsupport/frame_writer.cc",
     "testsupport/frame_writer.h",
     "testsupport/iosfileutils.mm",
     "testsupport/metrics/video_metrics.cc",
     "testsupport/metrics/video_metrics.h",
     "testsupport/mock/mock_frame_reader.h",
     "testsupport/mock/mock_frame_writer.h",
     "testsupport/packet_reader.cc",
     "testsupport/packet_reader.h",
     "testsupport/perf_test.cc",
     "testsupport/perf_test.h",
     "testsupport/trace_to_stderr.cc",
     "testsupport/trace_to_stderr.h",
   ]
 
   deps = [
     "../base:gtest_prod",
+    "../base:rtc_base_approved",
     "../common_video",
     "../system_wrappers",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_clang) {
     # Suppress warnings from the Chromium Clang plugin.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
@@ skipping 255 matching lines @@
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps = [
     ":test_support",
     ":video_test_common",
     "../modules/media_file",
     "//testing/gtest",
   ]
 }