Add more diagnostics to UX watch list.

WATCHLISTS

Index: WATCHLISTS
diff --git a/WATCHLISTS b/WATCHLISTS
index 32e07369d25f7d9aa17f9fe27aad5a9fc4472eaf..22df0f51c416b038174c5f659d537a3215d180e4 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -21,7 +21,18 @@
       'filepath': '^pkg/front_end',
     },
     'messages_review': {
-      'filepath': '^pkg/front_end/messages.yaml',
+      'filepath': (
+        '^('
+        'pkg/front_end/messages\\.yaml|'
+        'pkg/compiler/lib/src/diagnostics/messages\\.dart|'
+        'pkg/analyzer/lib/src/analysis_options/error/option_codes\\.dart|'
+        'pkg/analyzer/lib/src/dart/error/hint_codes\\.dart|'
+        'pkg/analyzer/lib/src/dart/error/lint_codes\\.dart|'
+        'pkg/analyzer/lib/src/dart/error/todo_codes\\.dart|'
+        'pkg/analyzer/lib/src/html/error/html_codes\\.dart|'
+        'pkg/dart_messages/lib/shared_messages\\.dart'
+        ')$'
+      )
     },
   },