[AiS] Use top local result for prefetch.

chrome/browser/autocomplete/search_provider.h

Index: chrome/browser/autocomplete/search_provider.h
diff --git a/chrome/browser/autocomplete/search_provider.h b/chrome/browser/autocomplete/search_provider.h
index 14a4836e2c6fc63aa14fa1bd3fa3d41de79c8f23..a9378a62f056aad286ad205f01965de5400201d6 100644
--- a/chrome/browser/autocomplete/search_provider.h
+++ b/chrome/browser/autocomplete/search_provider.h
@@ -260,7 +260,10 @@ class SearchProvider : public BaseSearchProvider,
       bool input_multiple_words,
       const base::string16& input_text,
       bool is_keyword);
-
+  void ScoreHistoryResultsMultiWord(
+      const HistoryResults& results,
+      bool is_keyword,
+      SearchSuggestionParser::SuggestResults* scored_results);
   // Adds matches for |results| to |map|.
   void AddSuggestResultsToMap(
       const SearchSuggestionParser::SuggestResults& results,
@@ -340,6 +343,10 @@ class SearchProvider : public BaseSearchProvider,
   HistoryResults keyword_history_results_;
   HistoryResults default_history_results_;
 
+  // Scored searches in the user's history - based on xxx_history_results_.
+  SearchSuggestionParser::SuggestResults scored_keyword_history_results_;
+  SearchSuggestionParser::SuggestResults scored_default_history_results_;
+
   // A timer to start a query to the suggest server after the user has stopped
   // typing for long enough.
   base::OneShotTimer<SearchProvider> timer_;