Add content/child/scheduler to scheduler watchlist

WATCHLISTS

 # Copyright (c) 2012 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.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 607 matching lines @@
     'sandbox': {
       'filepath': 'sandbox/'\
                   '|content/browser/bootstrap_sandbox_mac'\
                   '|content/browser/renderer_host/render_sandbox_host_linux'\
                   '|content/browser/renderer_host/sandbox_ipc_linux'\
                   '|content/browser/zygote_host/'\
                   '|content/common/sandbox_'\
                   '|content/zygote/'\
     },
     'scheduler': {
-      'filepath': 'cc/scheduler|'\
-                  'content/renderer/scheduler'
+      'filepath': 'cc/scheduler'\
+                  '|content/child/scheduler'\
+                  '|content/renderer/scheduler'
     },
     'search': {
       'filepath': 'chrome/browser/ui/search/',
     },
     'service_worker': {
       'filepath': 'content/(browser|renderer|child|common)/service_worker/',
     },
     'site_instance': {
       'filepath': 'content/browser/site_instance|'\
         'content/browser/browsing_instance',
@@ skipping 463 matching lines @@
                      'posciak+watch@chromium.org'],
     'website_settings': ['markusheintz@chromium.org'],
     'windows_sandboxing': ['wfh+watch@chromium.org'],
     'worker': ['jam@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
     'zoom': ['wjmaclean@chromium.org'],
   },
 }