Add hirokisato, sarakato to watch a11y

Bug: none
Change-Id: I7317204057092f41ee40128f6ecb264340e84da2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903233Reviewed-by: Sara Kato <sarakato@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Auto-Submit: Sara Kato <sarakato@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713517}

WATCHLISTS

@@ -1948,9 +1948,11 @@
                       'dmazzoni+watch@chromium.org',
                       'dougt+watch@chromium.org',
                       'dtseng+watch@chromium.org',
+                      'hirokisato+watch@chromium.org',
                       'je_julie.kim@chromium.org',
                       'kbabbitt@microsoft.com',
                       'nektar+watch@chromium.org',
+                      'sarakato+watch@chromium.org',
                       'yuzo+watch@chromium.org'],
     'add_to_homescreen': ['dominickn+watch-a2hs@chromium.org',
                           'hanxi+watch@chromium.org',