Add a tab helper to record the last visit date for each bookmark.

components/ntp_snippets.gypi

Index: components/ntp_snippets.gypi
diff --git a/components/ntp_snippets.gypi b/components/ntp_snippets.gypi
index bf30979465ecda6bc6752d79acbd7fe3eee5b749..341be80589cd4c49058562dcbcc0c373d8abb1d7 100644
--- a/components/ntp_snippets.gypi
+++ b/components/ntp_snippets.gypi
@@ -17,6 +17,7 @@
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
         '../third_party/icu/icu.gyp:icuuc',
+        'bookmarks_browser',
         'data_use_measurement_core',
         'image_fetcher',
         'keyed_service_core',
@@ -30,6 +31,8 @@
         'variations_net',
       ],
       'sources': [
+        'ntp_snippets/bookmarks/bookmark_last_visit_utils.cc',
+        'ntp_snippets/bookmarks/bookmark_last_visit_utils.h',
         'ntp_snippets/content_suggestion.cc',
         'ntp_snippets/content_suggestion.h',
         'ntp_snippets/content_suggestions_category_status.cc',