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 fa37cf8568c096836159447c3213f6fee9ab712e..3ece726c7a63fb2060c5643fddd0f2331955090a 100644
--- a/components/ntp_tiles/ntp_tile.h
+++ b/components/ntp_tiles/ntp_tile.h
@@ -24,6 +24,12 @@ struct NTPTile {
   // Only valid for source == WHITELIST (empty otherwise).
   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();