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

components/autofill/core/browser/autocomplete_history_manager.h

 // Copyright 2013 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_AUTOCOMPLETE_HISTORY_MANAGER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOCOMPLETE_HISTORY_MANAGER_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 55 matching lines @@
   AutofillDriver* driver_;
   scoped_refptr<AutofillWebDataService> database_;
 
   // When the manager makes a request from WebDataServiceBase, the database is
   // queried on another thread, we record the query handle until we get called
   // back.  We also store the autofill results so we can send them together.
   WebDataServiceBase::Handle pending_query_handle_;
   int query_id_;
   std::vector<Suggestion> autofill_suggestions_;
 
+  // Field contents.
+  base::string16 pending_query_prefix_;
+
   // Delegate to perform external processing (display, selection) on
   // our behalf.  Weak.
   AutofillExternalDelegate* external_delegate_;
 
   // Delegate to provide whether or not autocomplete functionality is enabled.
   AutofillClient* const autofill_client_;
 
   // Whether IPC is sent.
   bool send_ipc_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteHistoryManager);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOCOMPLETE_HISTORY_MANAGER_H_