Most visited iframe now postMessage to signal the iframing page that the link has been displayed

chrome/common/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_NTP_LOGGING_EVENTS_H_
 #define CHROME_COMMON_NTP_LOGGING_EVENTS_H_
 
 // The different types of events that are logged from the NTP.
 enum NTPLoggingEventType {
   // The user moused over an NTP tile or title.
   NTP_MOUSEOVER = 0,
 
   // The page attempted to load a thumbnail image.
   NTP_THUMBNAIL_ATTEMPT = 1,
 
   // There was an error in loading both the thumbnail image and the fallback
   // (if it was provided), resulting in a grey tile.
   NTP_THUMBNAIL_ERROR = 2,
 
-  // The page attempted to load a thumbnail URL while a fallback thumbnail was
-  // provided.
-  NTP_FALLBACK_THUMBNAIL_REQUESTED = 3,
-
-  // The primary thumbnail image failed to load and caused us to use the
-  // secondary thumbnail as a fallback.
-  NTP_FALLBACK_THUMBNAIL_USED = 4,
+  // DEPRECATED: NTP_FALLBACK_THUMBNAIL_REQUESTED = 3,

[sky, 2014/01/09 00:25:34]

nit: Since you're commenting out the constants they aren't available anymore. I
thought 'removed' or 'historical' would be better here.

[beaudoin, 2014/01/15 23:39:56]

Just cleaned up this whole enum. Since it's only internal it shouldn't matter.

+  // DEPRECATED: NTP_FALLBACK_THUMBNAIL_USED = 4,
 
   // The suggestion is coming from the server.
   NTP_SERVER_SIDE_SUGGESTION = 5,
 
   // The suggestion is coming from the client.
   NTP_CLIENT_SIDE_SUGGESTION = 6,
 
   // The visuals of that tile are handled externally by the page itself.
   NTP_EXTERNAL_TILE = 7,
 
+  // Indicates a tile was rendered, no matter if it's a thumbnail, a gray tile
+  // or an external tile.
+  NTP_TILE = 8,
+
+  // Used when no thumbnail is specified and a gray tile with the domain is used
+  // as the main tile.
+  NTP_GRAY_TILE = 9,
+
+  // Used a gray tile with the domain as the fallback for a failed thumbnail.
+  NTP_GRAY_TILE_FALLBACK = 10,
+
+  // The visuals of that tile's fallback are handled externally.
+  NTP_EXTERNAL_FALLBACK = 11,
+
   NTP_NUM_EVENT_TYPES
 };
 
 #endif  // CHROME_COMMON_NTP_LOGGING_EVENTS_H_