Add metro driver and delegate_execute to GN build.

win8/delegate_execute/delegate_execute.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/util/version.gypi',
     '../../build/win_precompile.gypi',
   ],
   'targets': [
     {
+      # GN version: //win8/delegate_execute:version_resources
       'target_name': 'delegate_execute_version_resources',
       'type': 'none',
       'conditions': [
         ['branding == "Chrome"', {
           'variables': {
              'branding_path': '../../chrome/app/theme/google_chrome/BRANDING',
           },
         }, { # else branding!="Chrome"
           'variables': {
              'branding_path': '../../chrome/app/theme/chromium/BRANDING',
           },
         }],
       ],
       'variables': {
         'output_dir': 'delegate_execute',
         'template_input_path': '../../chrome/app/chrome_version.rc.version',
       },
       'sources': [
         'delegate_execute_exe.ver',
       ],
       'includes': [
         '../../chrome/version_resource_rules.gypi',
       ],
     },
     {
+      # GN version: //win8/delegate_execute
       'target_name': 'delegate_execute',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../breakpad/breakpad.gyp:breakpad_handler',
         '../../chrome/chrome.gyp:installer_util',
         '../../content/content.gyp:content_common',
         '../../google_update/google_update.gyp:google_update',
         '../../ui/base/ui_base.gyp:ui_base',
         '../../ui/gfx/gfx.gyp:gfx',
@@ skipping 29 matching lines @@
           ],
         }],
         ['branding!="Chrome"', {
           'dependencies!': [
             '../../google_update/google_update.gyp:google_update',
           ],
         }],
       ],
     },
     {
+      # GN version: //win8/delegate_execute:delegate_execute_unittests
       'target_name': 'delegate_execute_unittests',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:run_all_unittests',
         '../../testing/gtest.gyp:gtest',
       ],
       'sources': [
         'delegate_execute_util.cc',
         'delegate_execute_util.h',
         'delegate_execute_util_unittest.cc',
       ],
     },
   ],
 }