Define os_posix in gyp files to get new Unix platforms added quickly

app/app_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': {
       'app_base_target': 0,
     },
     'target_conditions': [
@@ skipping 13 matching lines @@
             '../ui/base/system_monitor/system_monitor_posix.cc',
             '../ui/base/system_monitor/system_monitor_win.cc',
             '../ui/base/ui_base_paths.h',
             '../ui/base/ui_base_paths.cc',
             '../ui/base/ui_base_switches.h',
             '../ui/base/ui_base_switches.cc',
             'app_paths.h',
             'app_paths.cc',
         ],
         'conditions': [
-          ['OS!="linux" and OS!="freebsd" and OS!="openbsd"', {
+          ['toolkit_gtk!=1', {
             'sources!': [
               '../ui/base/dragdrop/gtk_dnd_util.cc',
               '../ui/base/dragdrop/gtk_dnd_util.h',
               '../ui/base/gtk/gtk_signal.h',
               '../ui/base/gtk/gtk_signal_registrar.cc',
               '../ui/base/gtk/gtk_signal_registrar.h',
               '../ui/base/gtk/gtk_windowing.cc',
               '../ui/base/gtk/gtk_windowing.h',
               '../ui/base/x/x11_util.cc',
               '../ui/base/x/x11_util.h',
@@ skipping 169 matching lines @@
         'win/iat_patch_function.cc',
         'win/iat_patch_function.h',
         'win/scoped_co_mem.h',
         'win/scoped_com_initializer.h',
         'win/scoped_prop.cc',
         'win/scoped_prop.h',
         'win/shell.cc',
         'win/shell.h',
       ],
       'conditions': [
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['toolkit_gtk==1', {
           'dependencies': [
             # font_gtk.cc uses fontconfig.
             # TODO(evanm): I think this is wrong; it should just use GTK.
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:x11',
             '../build/linux/system.gyp:xext',
           ],
           'link_settings': {
             'libraries': [
@@ skipping 31 matching lines @@
             '../ui/base/dragdrop/os_exchange_data.cc',
             '../ui/base/view_prop.cc',
             '../ui/base/view_prop.h',
             'win/iat_patch_function.cc',
             'win/iat_patch_function.h',
           ],
           'sources/': [
             ['exclude', '^win/*'],
           ],
         }],
-        ['OS=="linux"', {
+        ['use_x11==1', {
           'sources!': [
             '../ui/base/keycodes/keyboard_code_conversion_mac.mm',
             '../ui/base/keycodes/keyboard_code_conversion_mac.h',
             '../ui/base/keycodes/keyboard_codes_win.h',
           ],
           'all_dependent_settings': {
             'ldflags': [
               '-L<(PRODUCT_DIR)',
             ],
             'link_settings': {
@@ skipping 78 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }