Work on GN build of Chrome.

printing/printing.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,
   },
   'targets': [
     {
@@ skipping 236 matching lines @@
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
     {
+      # GN version: //printing:cups (config, not a target).
       'target_name': 'cups',
       'type': 'none',
       'conditions': [
         ['use_cups==1', {
           'direct_dependent_settings': {
             'defines': [
               'USE_CUPS',
             ],
             'conditions': [
               ['OS=="mac"', {
@@ skipping 42 matching lines @@
           },
           'dependencies': [
             '../base/base.gyp:base_java',
           ],
           'includes': [ '../build/java.gypi'  ],
         }
       ]
     }],
   ]
 }