NTP: Record TileType metrics also on desktop

chrome/common/instant.mojom

Index: chrome/common/instant.mojom
diff --git a/chrome/common/instant.mojom b/chrome/common/instant.mojom
index 581a8b5cc97e4f02cbf0a8d24ab5c7bbcc1d7c28..45c9da14459ae37605360fd02687ab4b90fb7b83 100644
--- a/chrome/common/instant.mojom
+++ b/chrome/common/instant.mojom
@@ -17,6 +17,9 @@ enum OmniboxFocusState;
 [Native]
 enum TileSource;
 
+[Native]
+enum TileVisualType;
+
 // Interface used to connect to the embedded search interface. This is a
 // separate interface such that a reverse connection (|client| below) can be
 // passed when connecting.
@@ -57,12 +60,14 @@ interface Instant {
   // Logs an impression on one of the Most Visited tile on the InstantExtended
   // New Tab Page.
   LogMostVisitedImpression(int32 page_seq_no, int32 position,
-                           TileSource tile_source);
+                           TileSource tile_source,
+                           TileVisualType tile_type);
 
   // Logs a navigation on one of the Most Visited tile on the InstantExtended
   // New Tab Page.
   LogMostVisitedNavigation(int32 page_seq_no, int32 position,
-                           TileSource tile_source);
+                           TileSource tile_source,
+                           TileVisualType tile_type);
 
   // Tells InstantExtended to paste text into the omnibox.  If text is empty,
   // the clipboard contents will be pasted. This causes the omnibox dropdown to