Printing: Convert PrintingContext into an interface implemented by the separate

printing/printing.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 34 matching lines @@
         'print_settings.h',
         'printed_document.cc',
         'printed_document_cairo.cc',
         'printed_document_mac.cc',
         'printed_document_win.cc',
         'printed_document.h',
         'printed_page.cc',
         'printed_page.h',
         'printed_pages_source.h',
         'printing_context.h',
+        'printing_context.cc',
+        'printing_context_cairo.h',
         'printing_context_cairo.cc',
+        'printing_context_mac.h',
         'printing_context_mac.mm',
+        'printing_context_win.h',
         'printing_context_win.cc',
         'units.cc',
         'units.h',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
       },
       'conditions': [
@@ skipping 63 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: