[Mac/GN] Set up the component build.

third_party/WebKit/Source/platform/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")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
@@ skipping 353 matching lines @@
       "scroll/ScrollAnimator.cpp",
       "scroll/ScrollAnimator.h",
 
       # Uses LocaleMac instead.
       "text/LocaleICU.cpp",
       "text/LocaleICU.h",
     ]
 
     configs += [ "//third_party/WebKit/Source:mac_precompiled_headers" ]
     libs = [
+      "AppKit.framework",
       "Accelerate.framework",
       "Carbon.framework",
       "Foundation.framework",
     ]
   } else {
     sources -= [
       "geometry/cg/FloatPointCG.cpp",
       "geometry/cg/FloatRectCG.cpp",
       "geometry/cg/FloatSizeCG.cpp",
       "geometry/cg/IntPointCG.cpp",
@@ skipping 217 matching lines @@
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   source_set("blink_x86_sse") {
     sources = blink_platform_sse_files
     deps = [
       ":blink_common",
     ]
   }
 }