Create //components/ntp_tiles.

components/ntp_tiles/pref_names.cc

+// 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.
+
+#include "components/ntp_tiles/pref_names.h"
+
+namespace ntp_tiles {
+namespace prefs {
+
+// Ordered list of website suggestions shown on the new tab page that will allow
+// retaining the order even if the suggestions change over time.
+const char kNTPSuggestionsURL[] = "ntp.suggestions_url";
+
+// Whether the suggestion was derived from personal data.
+const char kNTPSuggestionsIsPersonal[] = "ntp.suggestions_is_personal";
+
+}  // namespace prefs
+}  // namespace ntp_tiles