Provide assumed favicon for intents if service provider page was never visited.

chrome/browser/history/thumbnail_database.h

 // Copyright (c) 2011 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_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 147 matching lines @@
   // Returns true if the update succeeded.
   bool UpdateIconMapping(IconMappingID mapping_id, FaviconID icon_id);
 
   // Deletes the icon mapping entries for the given page url.
   // Returns true if the deletion succeeded.
   bool DeleteIconMappings(const GURL& page_url);
 
   // Checks whether a favicon is used by any URLs in the database.
   bool HasMappingFor(FaviconID id);
 
+  // Clones the existing mappings from |old_page_url| if |new_page_url| has no
+  // mappings. Otherwise, will leave mappings alone.
+  bool CloneIconMapping(const GURL& old_page_url, const GURL& new_page_url);
+
   // Temporary IconMapping -----------------------------------------------------
   //
   // Creates a temporary table to store icon mapping. Icon mapping will be
   // copied to this table by AddToTemporaryIconMappingTable() and then the
   // original table will be dropped, leaving only those copied mapping
   // remaining. This is used to quickly delete most of the icon mapping when
   // clearing history.
   bool InitTemporaryIconMappingTable() {
     return InitIconMappingTable(&db_, true);
   }
@@ skipping 113 matching lines @@
   const HistoryPublisher* history_publisher_;
 
   // True if migration to TopSites has been done and the thumbnails
   // table should not be used.
   bool use_top_sites_;
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_