Create bookmarks component with names of bookmark preferences

components/bookmarks/bookmark_pref_names.h

Index: components/bookmarks/bookmark_pref_names.h
diff --git a/components/bookmarks/bookmark_pref_names.h b/components/bookmarks/bookmark_pref_names.h
new file mode 100644
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+++ b/components/bookmarks/bookmark_pref_names.h
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+// Copyright (c) 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.
+
+// Constants for the names of various bookmarks preferences.
+
+#ifndef COMPONENTS_BOOKMARKS_BOOKMARK_PREF_NAMES_H_
+#define COMPONENTS_BOOKMARKS_BOOKMARK_PREF_NAMES_H_
+
+namespace prefs {
+extern const char kBookmarkEditorExpandedNodes[];
+extern const char kBookmarkPromptEnabled[];
+extern const char kBookmarkPromptImpressionCount[];
+extern const char kShowBookmarkBar[];
+extern const char kEditBookmarksEnabled[];
+extern const char kShowAppsShortcutInBookmarkBar[];
+}  // namespace prefs
+
+#endif  // COMPONENTS_BOOKMARKS_BOOKMARK_PREF_NAMES_H_