Omnibox: Add Mid-Input Matching to HistoryQuick Provider

chrome/browser/history/in_memory_url_index.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_IN_MEMORY_URL_INDEX_H_
 #define CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_H_
 
 #include <functional>
 #include <map>
 #include <set>
@@ skipping 99 matching lines @@
   // history database.
   void Init();
 
   // Signals that any outstanding initialization should be canceled and
   // flushes the cache to disk.
   void ShutDown();
 
   // Scans the history index and returns a vector with all scored, matching
   // history items. This entry point simply forwards the call on to the
   // URLIndexPrivateData class. For a complete description of this function
-  // refer to that class.
-  ScoredHistoryMatches HistoryItemsForTerms(const string16& term_string);
+  // refer to that class.  If |cursor_position| is string16::npos, the
+  // function doesn't do anything special with the cursor; this is equivalent
+  // to the cursor being at the end.
+  ScoredHistoryMatches HistoryItemsForTerms(const string16& term_string,
+                                            size_t cursor_position);
 
   // Deletes the index entry, if any, for the given |url|.
   void DeleteURL(const GURL& url);
 
   // Sets the optional observers for completion of restoral and saving of the
   // index's private data.
   void set_restore_cache_observer(
       RestoreCacheObserver* restore_cache_observer) {
     restore_cache_observer_ = restore_cache_observer;
   }
@@ skipping 152 matching lines @@
   // TODO(mrossetti): Eliminate once the transition to SQLite has been done.
   // http://crbug.com/83659
   bool needs_to_be_cached_;
 
   DISALLOW_COPY_AND_ASSIGN(InMemoryURLIndex);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_H_