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

chrome/browser/history/history_backend.cc

 // 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.
 
 #include "chrome/browser/history/history_backend.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 1641 matching lines @@
                                                 &icon_mappings))
     return;
 
   for (std::vector<IconMapping>::iterator m = icon_mappings.begin();
        m != icon_mappings.end(); ++m) {
     thumbnail_db_->SetFaviconLastUpdateTime(m->icon_id, Time());
   }
   ScheduleCommit();
 }
 
+void HistoryBackend::CloneFavicon(const GURL& old_page_url,
+                                  const GURL& new_page_url) {
+  if (!thumbnail_db_.get())
+    return;
+
+  // Prevent cross-domain cloning.
+  if (old_page_url.GetOrigin() != new_page_url.GetOrigin())
+    return;
+
+  thumbnail_db_->CloneIconMapping(old_page_url, new_page_url);
+  ScheduleCommit();
+}
+
 void HistoryBackend::SetImportedFavicons(
     const std::vector<ImportedFaviconUsage>& favicon_usage) {
   if (!db_.get() || !thumbnail_db_.get())
     return;
 
   Time now = Time::Now();
 
   // Track all URLs that had their favicons set or updated.
   std::set<GURL> favicons_changed;
 
@@ skipping 631 matching lines @@
         break;
       }
     }
   }
   UMA_HISTOGRAM_TIMES("History.GetFavIconFromDB",  // historical name
                       TimeTicks::Now() - beginning_time);
   return success;
 }
 
 }  // namespace history