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

components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h

Index: components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h
diff --git a/components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h b/components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h
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index 0000000000000000000000000000000000000000..3b535d6283a0d973fe3f79179257966dbe04ead9
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+++ b/components/ntp_snippets/bookmarks/bookmark_last_visit_utils.h
@@ -0,0 +1,33 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_NTP_SNIPPETS_BOOKMARKS_BOOKMARK_LAST_VISIT_UTILS_H_
+#define COMPONENTS_NTP_SNIPPETS_BOOKMARKS_BOOKMARK_LAST_VISIT_UTILS_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "components/bookmarks/browser/bookmark_model.h"
+#include "components/bookmarks/browser/bookmark_node.h"
+
+namespace ntp_snippets {
+
+//

[Marc Treib, 2016/07/29 14:36:43]

Comment?

[jkrcal, 2016/07/29 15:34:07]

Done.

+void UpdateBookmarkOnURLVisitedInMainFrame(
+    bookmarks::BookmarkModel* bookmark_model,
+    const GURL& url);
+
+base::Time GetLastVisitDateForBookmark(
+    const bookmarks::BookmarkNode* node);
+
+std::vector<const bookmarks::BookmarkNode*> GetRecentlyVisitedBookmarks(
+    bookmarks::BookmarkModel* bookmark_model,
+    int max_count,
+    const base::Time& min_visit_time);
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_BOOKMARKS_BOOKMARK_LAST_VISIT_UTILS_H_