Add new watchlist for accessibility component extensions

TBR=dtseng@chromium.org

Bug: None
Change-Id: Id7083310af76916f45b87318be7142a4caf07494
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929263Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#717759}

WATCHLISTS

@@ -25,6 +25,9 @@
                   '|isimpledom' \
                   '|liblouis'
     },
+    'accessibility_component_extensions': {
+      'filepath': 'chrome/browser/resources/chromeos/accessibility'
+    },
     'add_to_homescreen': {
       'filepath': 'chrome/android/java/src/org/chromium/chrome/browser/webapps/|'\
                   'chrome/android/javatests/src/org/chromium/chrome/browser/webapps/|'\
@@ -1970,6 +1973,7 @@
                       'nektar+watch@chromium.org',
                       'sarakato+watch@chromium.org',
                       'yuzo+watch@chromium.org'],
+    'accessibility_component_extensions': ['anastasi+watch@google.com'],
     'add_to_homescreen': ['dominickn+watch-a2hs@chromium.org',
                           'hanxi+watch@chromium.org',
                           'pkotwicz+watch@chromium.org',