Update WATCHLISTS for tab_ui_and_start_surface

Include everything in org.chromium.chrome.browser.tasks as well.

Bug: None
Change-Id: I2dd1bb22674f158036d098c09c4f550be1bc19c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877815Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708920}

WATCHLISTS

@@ -1698,7 +1698,8 @@
     },
     'tab_ui_and_start_surface': {
       'filepath': 'chrome/android/features/tab_ui/' \
-        '|chrome/android/features/start_surface/',
+                  '|chrome/android/features/start_surface/' \
+                  '|chrome/android/.*/src/org/chromium/chrome/browser/tasks/'
     },
     'tbmv2_metrics': {
       'filepath': 'third_party/catapult/tracing/tracing/metrics'