Add yzshen to the watchlist of Mandoline.

Review URL: https://codereview.chromium.org/1137663003

Cr-Commit-Position: refs/heads/master@{#328965}

WATCHLISTS

@@ -437,6 +437,9 @@
     'linux_seccomp_bpf': {
       'filepath': 'content/common/sandbox.*linux.cc',
     },
+    'mandoline': {
+      'filepath': 'mandoline',
+    },
     'md_settings': {
       'filepath': 'ui/webui/resources/cr_element'\
                   '|chrome/browser/resources/md_settings/'\
@@ -977,6 +980,7 @@
     'linux_sandboxing': ['jln+watch@chromium.org'],
     'linux_seccomp_bpf': ['jln+watch@chromium.org'],
     'supervised_users': ['pam+watch@chromium.org'],
+    'mandoline': ['yzshen+watch@chromium.org'],
     'md_settings': ['jhawkins+watch-md-settings@chromium.org',
                     'jlklein+watch-md-settings@chromium.org',
                     'khorimoto+watch-md-settings@chromium.org',