Add support for alternate window station.

sandbox/sandbox.gyp

 # Copyright (c) 2009 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.
 
 {
   'includes': [
     '../build/common.gypi',
   ],
   'conditions': [
     [ 'OS=="win"', {
@@ skipping 116 matching lines @@
             'src/shared_handles.cc',
             'src/shared_handles.h',
             'src/target_process.cc',
             'src/target_process.h',
             'src/target_services.cc',
             'src/target_services.h',
             'src/win2k_threadpool.cc',
             'src/win2k_threadpool.h',
             'src/win_utils.cc',
             'src/win_utils.h',
+            'src/window.h',
+            'src/window.cc',
 
             # Precompiled headers.
             'src/stdafx.cc',
             'src/stdafx.h',
           ],
           'include_dirs': [
             '..',
           ],
           'copies': [
             {
@@ skipping 170 matching lines @@
             'Debug': {
               'msvs_precompiled_header': 'sandbox_poc/pocdll/stdafx.h',
               'msvs_precompiled_source': 'sandbox_poc/pocdll/stdafx.cc',
             },
           },
         },
       ],
     }],
   ],
 }