Update WATCHLISTS for content/browser/scheduler.

R=skyostil@chromium.org

Change-Id: I68b3159d72b8d98b70920408fb7fc9b3cf16c265
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605905Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658593}

WATCHLISTS

@@ -618,6 +618,9 @@
       'filepath': 'chrome/browser/resources/md_'\
                   '|chrome/browser/resources/settings/',
     },
+    'browser_scheduler': {
+      'filepath': 'content/browser/scheduler'
+    },
     'browsing_data': {
       'filepath': 'browsing_data|BrowsingData',
     },
@@ -2137,6 +2140,7 @@
     'browser_compositor': ['piman+watch@chromium.org',
                            'vollick@chromium.org'],
     'browser_resources_md': ['michaelpg+watch-md-ui@chromium.org'],
+    'browser_scheduler': ['scheduler-bugs+browser@chromium.org'],
     'browsing_data': ['dullweber+watch@chromium.org',
                       'msramek+watch@chromium.org'],
     'bubble': ['hcarmona+bubble@chromium.org'],