Bring up of the enhanced bookmarks cluster service.

components/enhanced_bookmarks/pref_names.h

+// Copyright 2014 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_ENHANCED_BOOKMARKS_PREF_NAMES_H_
+#define COMPONENTS_ENHANCED_BOOKMARKS_PREF_NAMES_H_
+
+#include "build/build_config.h"
+
+namespace enhanced_bookmarks {
+namespace prefs {
+
+// Stores the last retrieved bookmark clusters from the server.
+extern const char kBookmarkClusters[];
+
+}  // namespace prefs
+}  // namespace enhanced_bookmarks
+
+#endif  // COMPONENTS_ENHANCED_BOOKMARKS_PREF_NAMES_H_