Cleanup: Change LogMostVisitedImpression|Navigation APIs to take an enum

chrome/common/search/ntp_logging_events.h

 // Copyright 2013 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 CHROME_COMMON_SEARCH_NTP_LOGGING_EVENTS_H_
 #define CHROME_COMMON_SEARCH_NTP_LOGGING_EVENTS_H_
 
 // The different types of events that are logged from the NTP. This enum is used
 // to transfer information from the NTP javascript to the renderer and is not
 // used as a UMA enum histogram's logged value.
@@ skipping 31 matching lines @@
 
   // The user moused over an NTP tile or title.
   NTP_MOUSEOVER = 9,
 
   // A NTP Tile has finished loading (successfully or failing).
   NTP_TILE_LOADED = 10,
 
   NTP_EVENT_TYPE_LAST = NTP_TILE_LOADED
 };
 
+// The source of an NTP tile.
+// Note: Keep in sync with browser/resources/local_ntp/most_visited_util.js and
+// browser/resources/local_ntp/most_visited_single.js.
+// TODO(treib): Merge this into MostVisitedSource from components/ntp_tiles.
+enum class NTPLoggingTileSource {
+  CLIENT = 0,
+  SERVER = 1,
+  LAST = SERVER
+};
+
 #endif  // CHROME_COMMON_SEARCH_NTP_LOGGING_EVENTS_H_