Add GN files for ui/platform_window/win.

ui/platform_window/win/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.
 
-component("ipc") {
-  output_name = "gfx_ipc"
+component("win_window") {
+  deps = [
+    "//base",
+    "//skia",
+    "//ui/events",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
+    "//ui/platform_window",
+  ]
+
+  defines = [ "WIN_WINDOW_IMPLEMENTATION" ]
 
   sources = [
-    "gfx_param_traits.cc",
-    "gfx_param_traits.h",
-  ]
-
-  defines = [ "GFX_IPC_IMPLEMENTATION" ]
-
-  deps = [
-    "//base",
-    "//ipc",
-    "//skia",
-    "//ui/gfx/geometry",
+    "win_window.cc",
+    "win_window.h",
+    "win_window_export.h",
   ]
 }