[New CL] 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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+// 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 <vector>
+
+class GURL;
+
+namespace base {
+class Time;
+}  // namespace base
+
+namespace bookmarks {
+class BookmarkModel;
+class BookmarkNode;
+}  // namespace bookmarks
+
+namespace ntp_snippets {
+
+// If there is a bookmark for |url|, this function updates its last visit date
+// to now. If there are multiple bookmarks for a given URL, it updates all of
+// them.
+void UpdateBookmarkOnURLVisitedInMainFrame(
+    bookmarks::BookmarkModel* bookmark_model,
+    const GURL& url);
+
+// Gets the last visit date for a given bookmark |node|. If the bookmark lacks
+// this info, it returns it creation date.
+base::Time GetLastVisitDateForBookmark(const bookmarks::BookmarkNode* node);
+
+// Returns the list of most recently visited bookmarks. For each bookmarked URL,
+// it returns the most recently created bookmark. The result is ordered by visit
+// time (the most recent first). Only bookmarks visited after
+// |min_visit_time| are considered, at most |max_count| bookmarks are returned.
+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_