Completing high dpi support for Instant Extended.

chrome/renderer/searchbox/searchbox.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_RENDERER_SEARCHBOX_SEARCHBOX_H_
 #define CHROME_RENDERER_SEARCHBOX_SEARCHBOX_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 18 matching lines @@
   virtual ~SearchBox();
 
   // Sends ChromeViewHostMsg_CountMouseover to the browser.
   void CountMouseover();
 
   // Sends ChromeViewHostMsg_SearchBoxDeleteMostVisitedItem to the browser.
   void DeleteMostVisitedItem(InstantRestrictedID most_visited_item_id);
 
   // Generates the favicon URL of the most visited item specified by the
   // |transient_url|. If the |transient_url| is valid, returns true and fills in
-  // |url|. If the |transient_url| is invalid, returns false  and |url| is not
-  // set.
+  // |url|. If the |transient_url| is invalid, returns true and |url| is set to
+  // "chrome-search://favicon/" in order to prevent the invalid URL to be
+  // requested.
   //
-  // Valid form of |transient_url|:
-  //    chrome-search://favicon/<render_view_id>/<most_visited_item_id>
+  // Valid forms of |transient_url|:
+  //    chrome-search://favicon/<view_id>/<restricted_id>
+  //    chrome-search://favicon/<favicon_parameters>/<view_id>/<restricted_id>
   bool GenerateFaviconURLFromTransientURL(const GURL& transient_url,
                                           GURL* url) const;
 
   // Generates the thumbnail URL of the most visited item specified by the
   // |transient_url|. If the |transient_url| is valid, returns true and fills in
   // |url|. If the |transient_url| is invalid, returns false  and |url| is not
   // set.
   //
   // Valid form of |transient_url|:
   //    chrome-search://thumb/<render_view_id>/<most_visited_item_id>
@@ skipping 78 matching lines @@
   string16 omnibox_font_;
   size_t omnibox_font_size_;
   string16 query_;
   int start_margin_;
   int width_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchBox);
 };
 
 #endif  // CHROME_RENDERER_SEARCHBOX_SEARCHBOX_H_