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

components/autofill/core/browser/autofill_external_delegate.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_AUTOFILL_EXTERNAL_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXTERNAL_DELEGATE_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 21 matching lines @@
   // Creates an AutofillExternalDelegate for the specified AutofillManager and
   // AutofillDriver.
   AutofillExternalDelegate(AutofillManager* manager,
                            AutofillDriver* driver);
   virtual ~AutofillExternalDelegate();
 
   // AutofillPopupDelegate implementation.
   void OnPopupShown() override;
   void OnPopupHidden() override;
   void DidSelectSuggestion(const base::string16& value,
-                           int identifier) override;
+                           int identifier,
+                           size_t match_start) override;
   void DidAcceptSuggestion(const base::string16& value,
                            int identifier,
                            int position) override;
   bool GetDeletionConfirmationText(const base::string16& value,
                                    int identifier,
                                    base::string16* title,
                                    base::string16* body) override;
   bool RemoveSuggestion(const base::string16& value, int identifier) override;
   void ClearPreviewedForm() override;
 
@@ skipping 100 matching lines @@
   std::vector<base::string16> data_list_labels_;
 
   base::WeakPtrFactory<AutofillExternalDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillExternalDelegate);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXTERNAL_DELEGATE_H_