[Mac/GN] Set up the component build.

ui/app_list/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")
 import("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 188 matching lines @@
       "cocoa/apps_search_results_controller.h",
       "cocoa/apps_search_results_controller.mm",
       "cocoa/apps_search_results_model_bridge.h",
       "cocoa/apps_search_results_model_bridge.mm",
       "cocoa/item_drag_controller.h",
       "cocoa/item_drag_controller.mm",
       "cocoa/scroll_view_with_no_scrollbars.h",
       "cocoa/scroll_view_with_no_scrollbars.mm",
     ]
     deps += [ "//third_party/google_toolbox_for_mac" ]
-    libs = [ "QuartzCore.framework" ]
+    libs = [
+      "AppKit.framework",
+      "QuartzCore.framework",
+    ]
   }
 }
 
 static_library("test_support") {
   sources = [
     "test/app_list_test_model.cc",
     "test/app_list_test_model.h",
     "test/app_list_test_view_delegate.cc",
     "test/app_list_test_view_delegate.h",
     "test/test_search_result.cc",
@@ skipping 110 matching lines @@
       "cocoa/app_list_view_controller_unittest.mm",
       "cocoa/app_list_window_controller_unittest.mm",
       "cocoa/apps_grid_controller_unittest.mm",
       "cocoa/apps_search_box_controller_unittest.mm",
       "cocoa/apps_search_results_controller_unittest.mm",
       "cocoa/test/apps_grid_controller_test_helper.h",
       "cocoa/test/apps_grid_controller_test_helper.mm",
     ]
   }
 }