[Mac/GN] Set up the component build.

ui/native_theme/BUILD.gn

 # Copyright 2014 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/ui.gni")
 
 component("native_theme") {
   sources = [
     "common_theme.cc",
     "common_theme.h",
@@ skipping 36 matching lines @@
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//ui/base",
     "//ui/display",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/resources",
   ]
+
+  if (is_mac) {
+    libs = [
+      "CoreGraphics.framework",
+      "AppKit.framework",
+    ]
+  }
 }