GN: Add system_wrappers_unittests, tools and tools_unittests

webrtc/modules/audio_device/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")
 
@@ skipping 117 matching lines @@
         "mac/audio_device_mac.h",
         "mac/audio_mixer_manager_mac.cc",
         "mac/audio_mixer_manager_mac.h",
         "mac/portaudio/pa_memorybarrier.h",
         "mac/portaudio/pa_ringbuffer.c",
         "mac/portaudio/pa_ringbuffer.h",
       ]
       libs = [
         "AudioToolbox.framework",
         "CoreAudio.framework",
+
+        # Needed for CGEventSourceKeyState in audio_device_mac.cc:
+        "CoreGraphics.framework",
       ]
     }
     if (is_ios) {
       deps += [ "../../sdk:rtc_sdk_common_objc" ]
       sources += [
         "ios/audio_device_ios.h",
         "ios/audio_device_ios.mm",
         "ios/audio_device_not_implemented_ios.mm",
         "ios/audio_session_observer.h",
         "ios/objc/RTCAudioSession+Configuration.mm",
@@ skipping 50 matching lines @@
     "../..:common_inherited_config",
     ":audio_device_config",
   ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }