[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"
 #include "base/strings/string16.h"
 
 namespace autofill {
 
 class AutofillProfile;
 class CreditCard;
 
 struct Suggestion {
  public:
+  enum MatchMode {
+    PREFIX_MATCH,    // for prefix matched suggestions;
+    SUBSTRING_MATCH  // for substring matched suggestions;
+  };
+
   Suggestion();
 
   // Copy constructor for STL containers.
   Suggestion(const Suggestion& other);
 
   explicit Suggestion(const base::string16& value);
 
   // Constructor for unit tests. It will convert the strings from UTF-8 to
   // UTF-16.
   Suggestion(const std::string& value,
              const std::string& label,
              const std::string& icon,
              int frontend_id);
 
   ~Suggestion();
 
   // GUID generated by the backend layer. This identifies the exact autofill
   // profile that generated this suggestion.
   std::string backend_id;
 
   // 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;
+  MatchMode match;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_SUGGESTION_H_