[AiS] Use top local result for prefetch.

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 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.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all autocomplete entries that start with "Search <engine>
 // for ...", including searching for the current input string, search
 // history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
@@ skipping 242 matching lines @@
                               int did_not_accept_suggestion,
                               MatchMap* map);
 
   // Calculates relevance scores for all |results|.
   SearchSuggestionParser::SuggestResults ScoreHistoryResults(
       const HistoryResults& results,
       bool base_prevent_inline_autocomplete,
       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,
       const std::string& metadata,
       MatchMap* map);
 
   // Gets the relevance score for the verbatim result.  This value may be
   // provided by the suggest server or calculated locally; if
   // |relevance_from_server| is non-NULL, it will be set to indicate which of
   // those is true.
@@ skipping 59 matching lines @@
   // The user's input.
   AutocompleteInput input_;
 
   // Input when searching against the keyword provider.
   AutocompleteInput keyword_input_;
 
   // Searches in the user's history that begin with the input text.
   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_;
 
   // The time at which we sent a query to the suggest server.
   base::TimeTicks time_suggest_request_sent_;
 
   // Fetchers used to retrieve results for the keyword and default providers.
   scoped_ptr<net::URLFetcher> keyword_fetcher_;
   scoped_ptr<net::URLFetcher> default_fetcher_;
 
   // Results from the default and keyword search providers.
   SearchSuggestionParser::Results default_results_;
   SearchSuggestionParser::Results keyword_results_;
 
   GURL current_page_url_;
 
   // Session token management.
   std::string current_token_;
   base::TimeTicks token_expiration_time_;
 
   // Answers prefetch management.
   AnswersQueryData prefetch_data_;     // Data to use for query prefetching.
   AnswersQueryData last_answer_seen_;  // Last answer seen.
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_