[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/core/browser/suggestion.h

 // Copyright 2014 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 COMPONENTS_AUTOFILL_CORE_BROWSER_SUGGESTION_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_SUGGESTION_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 28 matching lines @@
 
   // ID for the frontend to use in identifying the particular result. Positive
   // values are sent over IPC to identify the item selected. Negative values
   // (see popup_item_ids.h) have special built-in meanings. Default initialized
   // to 0.
   int frontend_id;
 
   base::string16 value;
   base::string16 label;
   base::string16 icon;
+
+  // Offset within the suggestion text matches the user input.
+  size_t match_start;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_SUGGESTION_H_