Find Favicon in priority of icon_type.

chrome/browser/history/thumbnail_database.h

Index: chrome/browser/history/thumbnail_database.h
diff --git a/chrome/browser/history/thumbnail_database.h b/chrome/browser/history/thumbnail_database.h
index 6ac1a2d42f927eceb6587e7a961515b73d28338c..1dc42bb50401238708496da044887d7254643c6c 100644
--- a/chrome/browser/history/thumbnail_database.h
+++ b/chrome/browser/history/thumbnail_database.h
@@ -177,6 +177,14 @@ class ThumbnailDatabase {
                                  int required_icon_types,
                                  std::vector<IconMapping>* mapping_data);
 
+  // Returns true if there are icon mappings for the given |page_url| and
+  // |required_icon_types|.
+  // The matched icon mappings are returned in the |mapping_data| parameter if
+  // it is not NULL.
+  bool GetAllIconMappingsForPageURL(const GURL& page_url,
+                                    int required_icon_types,
+                                    std::vector<IconMapping>* mapping_data);
+
   // Returns true if there is any matched icon mapping for the given page.
   // All matched icon mappings are returned in descent order of IconType if
   // mapping_data is not NULL.