Add metro driver and delegate_execute to GN build.

win8/metro_driver/metro_driver.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.
 {
   'conditions': [
     ['OS=="win"', {
       'variables': {
         'chromium_code': 1,
       },
       'includes': [
@@ skipping 11 matching lines @@
             'DelayLoadDLLs': [
               'API-MS-WIN-CORE-WINRT-ERROR-L1-1-0.DLL',
               'API-MS-WIN-CORE-WINRT-L1-1-0.DLL',
               'API-MS-WIN-CORE-WINRT-STRING-L1-1-0.DLL',
             ],
           },
         },
       },
       'targets': [
         {
+          # GN version: //win8/metro_driver:version_resources
           'target_name': 'metro_driver_version_resources',
           'type': 'none',
           'variables': {
             'output_dir': 'metro_driver',
             'branding_path': '../../chrome/app/theme/<(branding_path_component)/BRANDING',
             'template_input_path': '../../chrome/app/chrome_version.rc.version',
           },
           'sources': [
             'metro_driver_dll.ver',
           ],
           'includes': [
             '../../chrome/version_resource_rules.gypi',
           ],
         },
         {
+          # GN version: //win8/metro_driver
           'target_name': 'metro_driver',
           'type': 'shared_library',
           'dependencies': [
             '../../base/base.gyp:base',
             '../../chrome/common_constants.gyp:common_constants',
             '../../chrome/chrome.gyp:installer_util',
             '../../crypto/crypto.gyp:crypto',
             '../../ipc/ipc.gyp:ipc',
             '../../sandbox/sandbox.gyp:sandbox',
             '../../ui/events/events.gyp:events',
@@ skipping 50 matching lines @@
                 'secondary_tile.h',
                 'settings_handler.cc',
                 'settings_handler.h',
                 'toast_notification_handler.cc',
                 'toast_notification_handler.h',
               ],
             }],
           ],
           'copies': [
             {
+              # GN version: //win8/metro_viewer:copy_resources
               'destination': '<(PRODUCT_DIR)',
               'files': [
                 'resources/Logo.png',
                 'resources/SecondaryTile.png',
                 'resources/SmallLogo.png',
                 'resources/chrome.VisualElementsManifest.xml',
               ],
             },
           ],
         },
         {
+          # GN version: //win8/metro_driver:metro_driver_unittests
           'target_name': 'metro_driver_unittests',
           'type': 'executable',
           'dependencies': [
             '../../base/base.gyp:base',
             '../../chrome/chrome.gyp:installer_util',
             '../../testing/gtest.gyp:gtest',
             'metro_driver',
           ],
           'sources': [
             'run_all_unittests.cc',
             'winrt_utils.cc',
             'winrt_utils.h',
             'winrt_utils_unittest.cc',
           ],
         },
       ],
     },],
   ],
 }