InstantExtended: Prevent spurious themechanged/mostvisitedchanged events

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 <utility>
 
@@ skipping 105 matching lines @@
 };
 
 // The tiling of the theme background image.
 enum ThemeBackgroundImageTiling {
   THEME_BKGRND_IMAGE_NO_REPEAT,
   THEME_BKGRND_IMAGE_REPEAT_X,
   THEME_BKGRND_IMAGE_REPEAT_Y,
   THEME_BKGRND_IMAGE_REPEAT,
 };
 
+// Update IsThemeInfoEqual in chrome/renderer/searchbox/searchbox.cc
+// whenever any fields are added/removed.
 struct ThemeBackgroundInfo {
   ThemeBackgroundInfo();
   ~ThemeBackgroundInfo();
 
   // The theme background color in RGBA format where the R, G, B and A values
   // are between 0 and 255 inclusive and always valid.
   int color_r;
   int color_g;
   int color_b;
   int color_a;
@@ skipping 15 matching lines @@
 
   // The theme background image height.
   // Value is only valid if |theme_id| is valid.
   uint16 image_height;
 
   // True if theme has attribution logo.
   // Value is only valid if |theme_id| is valid.
   bool has_attribution;
 };
 
+// Update AreMostVisitedItemsEqual in chrome/renderer/searchbox/searchbox.cc
+// whenever any fields are added/removed.
 struct InstantMostVisitedItem {
   // The URL of the Most Visited item.
   GURL url;
 
   // The title of the Most Visited page.  May be empty, in which case the |url|
   // is used as the title.
   string16 title;
 };
 
 // An InstantMostVisitedItem along with its assigned restricted ID.
 typedef std::pair<InstantRestrictedID, InstantMostVisitedItem>
     InstantMostVisitedItemIDPair;
 
 #endif  // CHROME_COMMON_INSTANT_TYPES_H_