Pass AutocompleteProvider::kMaxMatches to InMemoryURLIndex

chrome/browser/history/url_index_private_data.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.
 
 #ifndef CHROME_BROWSER_HISTORY_URL_INDEX_PRIVATE_DATA_H_
 #define CHROME_BROWSER_HISTORY_URL_INDEX_PRIVATE_DATA_H_
 
 #include <set>
 #include <string>
 
@@ skipping 47 matching lines @@
   // cursor (if set), occur within the candidate's URL or page title.
   // Scores are then calculated on no more than |kItemsToScoreLimit|
   // candidates, as the scoring of such a large number of candidates may
   // cause perceptible typing response delays in the omnibox. This is
   // likely to occur for short omnibox terms such as 'h' and 'w' which
   // will be found in nearly all history candidates. Results are sorted by
   // descending score. The full results set (i.e. beyond the
   // |kItemsToScoreLimit| limit) will be retained and used for subsequent calls
   // to this function. |bookmark_service| is used to boost a result's score if
   // its URL is referenced by one or more of the user's bookmarks.  |languages|
-  // is used to help parse/format the URLs in the history index.
+  // is used to help parse/format the URLs in the history index.  In total,
+  // |max_matches| of items will be returned in the |ScoredHistoryMatches|
+  // vector.
   ScoredHistoryMatches HistoryItemsForTerms(base::string16 term_string,
                                             size_t cursor_position,
+                                            size_t max_matches,
                                             const std::string& languages,
                                             BookmarkService* bookmark_service);
 
   // Adds the history item in |row| to the index if it does not already already
   // exist and it meets the minimum 'quick' criteria. If the row already exists
   // in the index then the index will be updated if the row still meets the
   // criteria, otherwise the row will be removed from the index. Returns true
   // if the index was actually updated. |languages| gives a list of language
   // encodings by which the URLs and page titles are broken down into words and
   // characters. |scheme_whitelist| is used to filter non-qualifying schemes.
@@ skipping 308 matching lines @@
   // Used for unit testing only. Records the number of candidate history items
   // at three stages in the index searching process.
   size_t pre_filter_item_count_;    // After word index is queried.
   size_t post_filter_item_count_;   // After trimming large result set.
   size_t post_scoring_item_count_;  // After performing final filter/scoring.
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_URL_INDEX_PRIVATE_DATA_H_