Create a Factory for NativeMetafile.

printing/printing.gyp

 # Copyright (c) 2010 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,
   },
   'targets': [
     {
@@ skipping 18 matching lines @@
         'backend/print_backend_consts.cc',
         'backend/print_backend_consts.h',
         'backend/print_backend_dummy.cc',
         'emf_win.cc',
         'emf_win.h',
         'image.cc',
         'image_cairo.cc',
         'image_mac.cc',
         'image_win.cc',
         'image.h',
+        'metafile_factory.h',
+        'metafile_factory.cc',
         'native_metafile.h',
+        'native_metafile_linux.h'
+        'native_metafile_mac.h'
+        'native_metafile_win.h',
         'page_number.cc',
         'page_number.h',
         'page_overlays.cc',
         'page_overlays.h',
         'page_range.cc',
         'page_range.h',
         'page_setup.cc',
         'page_setup.h',
         'pdf_metafile_mac.cc',
         'pdf_metafile_mac.h',
@@ skipping 139 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: