Offline Pages: Add folks to watchlist and OWNERS files.

BUG=

Review URL: https://codereview.chromium.org/1910063002

Cr-Commit-Position: refs/heads/master@{#388846}
diff --git a/WATCHLISTS b/WATCHLISTS
index ee7f38f..5f67144 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1502,7 +1502,10 @@
     'ntp_snippets': ['[email protected]',
                      '[email protected]'],
     'offline_pages': ['[email protected]',
-                      '[email protected]'],
+                      '[email protected]',
+                      '[email protected]',
+                      '[email protected]',
+                      '[email protected]'],
     'omnibox': ['[email protected]'],
     'options': ['[email protected]',
                 '[email protected]'],