compositor_unittests target is unimplmented on Mac

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 406 matching lines @@
               ],
               'sources!': [
                 'atomicops_internals_x86_gcc.cc',
                 'message_pump_glib.cc',
                 'message_pump_x.cc',
               ],
           }],
           [ 'toolkit_uses_gtk==0', {
             'sources!': [ 'message_pump_gtk.cc', ],
           }],
-          [ '(touchui==0 and use_aura==0) or OS == "win"', {
+          [ '(touchui==0 and use_aura==0) or OS == "win" or OS == "mac"', {
             'sources!' : [ 'message_pump_x.cc', ],
           }, {
             'sources!' : [ 'message_pump_gtk.cc', ],
             'sources/' : [ [ 'include', '^message_pump_x\\.cc$', ] ],
           }],
           [ 'use_wayland==1', {
             'sources/': [
               [ 'exclude', '^message_pump_gtk\\.cc$',],
               [ 'exclude', '^message_pump_x\\.cc$',],
             ],
@@ skipping 398 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }