[NTP::SectionOrder] First version of click based category ranker.

components/ntp_snippets/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_snippets/pref_names.h"
 
 namespace ntp_snippets {
 namespace prefs {
 
 const char kEnableSnippets[] = "ntp_snippets.enable";
@@ skipping 43 matching lines @@
 const char kUserClassifierAverageSuggestionsUsedPerHour[] =
     "ntp_suggestions.user_classifier.average_suggestions_used_per_hour";
 
 const char kUserClassifierLastTimeToOpenNTP[] =
     "ntp_suggestions.user_classifier.last_time_to_open_ntp";
 const char kUserClassifierLastTimeToShowSuggestions[] =
     "ntp_suggestions.user_classifier.last_time_to_show_suggestions";
 const char kUserClassifierLastTimeToUseSuggestions[] =
     "ntp_suggestions.user_classifier.last_time_to_use_suggestions";
 
+const char kClickBasedCategoryRankerOrderWithClicks[] =
+    "ntp_suggestions.click_based_category_ranker.category_order_with_clicks";
+
 }  // namespace prefs
 }  // namespace ntp_snippets