Add support for components/ntp_tiles in InstantService

components/ntp_tiles/ntp_tile.h

Index: components/ntp_tiles/ntp_tile.h
diff --git a/components/ntp_tiles/ntp_tile.h b/components/ntp_tiles/ntp_tile.h
index 8baa4565f62e984c438fa4450b59ea54f9ec8300..e64a19fa6be8bf0b406717a811ad0b1f99fe2b7a 100644
--- a/components/ntp_tiles/ntp_tile.h
+++ b/components/ntp_tiles/ntp_tile.h
@@ -26,6 +26,12 @@ struct NTPTile {
   // is also available from another, higher-priority source.
   base::FilePath whitelist_icon_path;
 
+  // Only valid for source == SUGGESTIONS_SERVICE (empty otherwise).
+  // May point to a local chrome:// URL or to a remote one. May be empty.
+  GURL thumbnail_url;
+  // This won't be empty, but might 404 etc.
+  GURL favicon_url;
+
   NTPTile();
   NTPTile(const NTPTile&);
   ~NTPTile();