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

chrome/browser/resources/local_ntp/most_visited_util.js

Index: chrome/browser/resources/local_ntp/most_visited_util.js
diff --git a/chrome/browser/resources/local_ntp/most_visited_util.js b/chrome/browser/resources/local_ntp/most_visited_util.js
index 5a17fbd10bfff9b4e35d23d64c78312cf3c70ac5..d371dd1c15f3d36d8b359ba4468e0799516b5fea 100644
--- a/chrome/browser/resources/local_ntp/most_visited_util.js
+++ b/chrome/browser/resources/local_ntp/most_visited_util.js
@@ -15,25 +15,29 @@
  * @const
  */
 var NTP_LOGGING_EVENT_TYPE = {
-  // 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,
   // The suggestion is coming from the server.
-  NTP_SERVER_SIDE_SUGGESTION: 5,
+  NTP_SERVER_SIDE_SUGGESTION: 0,
   // The suggestion is coming from the client.
-  NTP_CLIENT_SIDE_SUGGESTION: 6,
+  NTP_CLIENT_SIDE_SUGGESTION: 1,
+  // Indicates a tile was rendered, no matter if it's a thumbnail, a gray tile
+  // or an external tile.
+  NTP_TILE: 2,
+  // The tile uses a local thumbnail image.
+  NTP_THUMBNAIL_TILE: 3,
+  // Used when no thumbnail is specified and a gray tile with the domain is used
+  // as the main tile.
+  NTP_GRAY_TILE: 4,
   // The visuals of that tile are handled externally by the page itself.
-  NTP_EXTERNAL_TILE: 7
+  NTP_EXTERNAL_TILE: 5,
+  // 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: 6,
+  // Used a gray tile with the domain as the fallback for a failed thumbnail.
+  NTP_GRAY_TILE_FALLBACK: 7,
+  // The visuals of that tile's fallback are handled externally.
+  NTP_EXTERNAL_TILE_FALLBACK: 8,
+  // The user moused over an NTP tile or title.
+  NTP_MOUSEOVER: 9
 };
 
 /**