Add dom@ to blink_script watch list

Bug: N/A
Change-Id: I60d6097499d49c178d0da83197bb2316a2240e37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215257Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772065}

WATCHLISTS

@@ -2272,7 +2272,7 @@
     'blink_scheduling_api': ['web-scheduling-api-reviews@chromium.org'],
     'blink_screen_orientation': ['mlamouri+watch-blink@chromium.org'],
     'blink_script': ['kouhei+script@chromium.org',
-                     'hiroshige+script@chromium.org'],
+                     'hiroshige+script@chromium.org', 'dom+watch@chromium.org'],
     'blink_scroll': ['bokan@chromium.org'],
     'blink_service_worker': ['horo+watch@chromium.org',
                              'jsbell+serviceworker@chromium.org',