Add a watchlist for the offline_items_collection component

WATCHLISTS

Index: WATCHLISTS
diff --git a/WATCHLISTS b/WATCHLISTS
index e811b4fc2dc0c8ded8c78375bd1fc1829193cf76..012c5570fb6ccd156b140eb0342d0e5104d35a6b 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -782,6 +782,9 @@
         'components/ntp_tiles/|'\
         'ios/chrome/browser/ntp_tiles'
     },
+    'offline_items_collection': {
+      'filepath': 'components/offline_items_collection/',
+    },
     'offline_pages': {
       'filepath': 'components/offline_pages/'\
                   '|chrome/browser/android/offline_pages/'\
@@ -2057,6 +2060,8 @@
                      'noyau+watch@chromium.org'],
     'ntp_tiles': ['ntp-dev+reviews@chromium.org',
                   'noyau+watch@chromium.org'],
+    'offline_items_collection': ['harkness+watch@chromium.org',
+                                 'peter@chromium.org'],
     'offline_pages': ['chili+watch@chromium.org',
                       'dewittj+watch@chromium.org',
                       'dimich+watch@chromium.org',