Most visited thumbnails and favicons need id-based urls

chrome/common/instant_types.h

 // Copyright 2012 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_INSTANT_TYPES_H_
 #define CHROME_COMMON_INSTANT_TYPES_H_
 
 #include <string>
 
 #include "base/string16.h"
@@ skipping 134 matching lines @@
   ThemeBackgroundImageAlignment image_vertical_alignment;
 
   // The theme background image tiling is only valid if |theme_id| is valid.
   ThemeBackgroundImageTiling image_tiling;
 
   // The theme background image height.
   // Value is only valid if |theme_id| is valid.
   uint16 image_height;
 };
 
-// A most visited item.
-struct MostVisitedItem {
-  // URL of the most visited page.
+struct InstantMostVisitedItem {
+  InstantMostVisitedItem() : most_visited_item_id(0) {}
+
+  // A private identifier used on the browser side when retrieving assets.
+  uint64 most_visited_item_id;
+
+  // The URL of the Most Visited item.
   GURL url;
 
-  // Title of the most visited page.
+  // The title of the Most Visited page.  May be empty, in which case the |url|
+  // is used as the title.
   string16 title;
 };
 
 #endif  // CHROME_COMMON_INSTANT_TYPES_H_