compositor_unittests target is unimplmented on Mac

printing/printing.gyp

 # Copyright (c) 2011 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 93 matching lines @@
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:gtkprint',
           ],
         }],
         ['OS=="mac" and use_skia==0', {
           'sources/': [
             ['exclude', 'pdf_metafile_skia\\.(cc|h)$'],
             ['exclude', 'metafile_skia_wrapper\\.(cc|h)$'],
           ],
         }],
+        # Mac-Aura does not support printing.
+        ['OS=="mac" and use_aura==1',{
+          'sources!': [
+            'printed_document_mac.cc',
+            'printing_context_mac.mm',
+            'printing_context_mac.h',
+          ],
+        }],
         ['OS=="mac" and use_aura==0',{
           'sources': [
             'printing_context_mac.mm',
             'printing_context_mac.h',
           ],
         }],
         ['OS=="win"', {
           'conditions': [
             ['use_aura==1', {
               'sources!': [
@@ skipping 134 matching lines @@
                   '<!@(python cups_config_helper.py --cflags)',
                 ],
               }],
             ],
           },
         }],
       ],
     },
   ],
 }