Add ShellIntegration::ActivateMetroChrome, which launches Chrome in metro-mode on Windows 8.

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 414 matching lines @@
           'win/event_trace_provider.cc',
           'win/event_trace_provider.h',
           'win/i18n.cc',
           'win/i18n.h',
           'win/iat_patch_function.cc',
           'win/iat_patch_function.h',
           'win/iunknown_impl.h',
           'win/iunknown_impl.cc',
           'win/metro.cc',
           'win/metro.h',
+          'win/metro_exports.cc',
+          'win/metro_exports.h',
           'win/object_watcher.cc',
           'win/object_watcher.h',
           'win/registry.cc',
           'win/registry.h',
           'win/resource_util.cc',
           'win/resource_util.h',
           'win/sampling_profiler.cc',
           'win/sampling_profiler.h',
           'win/scoped_bstr.cc',
           'win/scoped_bstr.h',
@@ skipping 491 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }