Split NTP_TILE_LOADED event.

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 25 matching lines @@
   // Deleted: NTP_THUMBNAIL_ERROR = 6,
 
   // Used a gray tile with the domain as the fallback for a failed thumbnail.
   // Deleted: NTP_GRAY_TILE_FALLBACK = 7,
 
   // The visuals of that tile's fallback are handled externally.
   // Deleted: NTP_EXTERNAL_TILE_FALLBACK = 8,
 
   // Deleted: NTP_MOUSEOVER = 9
 
-  // A NTP Tile has finished loading (successfully or failing).
+  // A NTP Tile has finished loading (successfully or failing). Logged only by
+  // the multi-iframe version of the NTP.
   NTP_TILE_LOADED = 10,
 
-  NTP_EVENT_TYPE_LAST = NTP_TILE_LOADED
+  // All NTP tiles have finished loading (successfully or failing). Logged only
+  // by the single-iframe version of the NTP.
+  NTP_ALL_TILES_LOADED = 11,
+
+  NTP_EVENT_TYPE_LAST = NTP_ALL_TILES_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_