Make ProcessWatcher use kqueues on Mac.

chrome/chrome.gyp

 # Copyright (c) 2009 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,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
@@ skipping 541 matching lines @@
         'common/platform_util_mac.mm',
         'common/platform_util_win.cc',
         'common/plugin_carbon_interpose_constants_mac.h',
         'common/plugin_carbon_interpose_constants_mac.cc',
         'common/plugin_messages.h',
         'common/plugin_messages_internal.h',
         'common/pref_member.cc',
         'common/pref_member.h',
         'common/pref_service.cc',
         'common/pref_service.h',
+        'common/process_watcher_mac.cc',
         'common/process_watcher_posix.cc',
         'common/process_watcher_win.cc',
         'common/process_watcher.h',
         'common/property_bag.cc',
         'common/property_bag.h',
         'common/ref_counted_util.h',
         'common/render_messages.h',
         'common/render_messages_internal.h',
         'common/renderer_preferences.h',
         'common/resource_dispatcher.cc',
@@ skipping 70 matching lines @@
               '-lXrender',
               '-lXext',
             ],
           },
         },],
         ['OS=="linux" and selinux==1', {
           'dependencies': [
             '../build/linux/system.gyp:selinux',
           ],
         }],
+        ['OS=="mac"', {
+          'sources!': [
+            'common/process_watcher_posix.cc',
+          ],
+        }],
         ['OS=="win"', {
           'include_dirs': [
             'third_party/wtl/include',
           ],
         }, { # else: OS != "win"
           'sources!': [
             'common/hi_res_timer_manager.cc',
             'common/hi_res_timer_manager.h',
             'common/temp_scaffolding_stubs.h',
           ],
@@ skipping 2051 matching lines @@
       }],  # targets
     }],  # OS=="linux" or OS=="freebsd"
   ],  # 'conditions'
 }
 
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