Integrate the Windows 8 code into the Chromium tree.

win8/win8.gyp

+# Copyright (c) 2012 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.
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'includes': [
+    '../build/win_precompile.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'check_sdk_patch',
+      'type': 'none',
+      'variables': {
+        'check_sdk_script': '<(DEPTH)/chrome/tools/build/win/check_sdk_patch.py',
+      },
+      'actions': [
+        {
+          'action_name': 'check_sdk_patch_action',
+          'inputs': [
+            '<@(windows_sdk_path)/Include/winrt/asyncinfo.h',
+          ],
+          'outputs': [
+            # This keeps the ninja build happy.
+            'dummy',
+          ],
+          'action': ['python', '<(check_sdk_script)', '<@(windows_sdk_path)'],
+        },
+      ],
+    },
+  ],
+}