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

app/app.gyp

 # Copyright (c) 2010 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,
   },
   'includes': [
     'app_base.gypi',
@@ skipping 39 matching lines @@
         'sql/sqlite_features_unittest.cc',
         'sql/statement_unittest.cc',
         'sql/transaction_unittest.cc',
         'test_suite.cc',
         'test_suite.h',
       ],
       'include_dirs': [
         '..',
       ],
       'conditions': [
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"', {
+        ['toolkit_uses_gtk==1', {
           'sources': [
             '../ui/base/dragdrop/gtk_dnd_util_unittest.cc',
           ],
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
             '../ui/base/strings/ui_strings.gyp:ui_unittest_strings',
           ],
         }],
         ['OS!="win"', {
           'sources!': [
             '../ui/base/dragdrop/os_exchange_data_win_unittest.cc',
             '../ui/base/view_prop_unittest.cc',
           ],
         }],
-        ['OS =="linux" or OS =="freebsd"', {
+        ['os_posix==1 and OS!="mac"', {
           'conditions': [
             ['linux_use_tcmalloc==1', {
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
       ],
     },
@@ skipping 16 matching lines @@
       'includes': [ '../build/grit_target.gypi' ],
     },
   ],
 }
 
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