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

components/autofill/core/browser/autofill_popup_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_POPUP_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_POPUP_DELEGATE_H_
 
 #include "base/strings/string16.h"
 
 namespace autofill {
 
 // An interface for interaction with AutofillPopupController. Will be notified
 // of events by the controller.
 class AutofillPopupDelegate {
  public:
   // Called when the Autofill popup is shown.
   virtual void OnPopupShown() = 0;
 
   // Called when the Autofill popup is hidden.
   virtual void OnPopupHidden() = 0;
 
   // Called when the autofill suggestion indicated by |identifier| has been
   // temporarily selected (e.g., hovered).
   virtual void DidSelectSuggestion(const base::string16& value,
-                                   int identifier) = 0;
+                                   int identifier,
+                                   size_t match_start) = 0;
 
   // Inform the delegate that a row in the popup has been chosen.
   virtual void DidAcceptSuggestion(const base::string16& value,
                                    int identifier,
                                    int position) = 0;
 
   // Returns whether the given value can be deleted, and if true,
   // fills out |title| and |body|.
   virtual bool GetDeletionConfirmationText(const base::string16& value,
                                            int identifier,
                                            base::string16* title,
                                            base::string16* body) = 0;
 
   // Delete the described suggestion. Returns true if something was deleted,
   // or false if deletion is not allowed.
   virtual bool RemoveSuggestion(const base::string16& value,
                                 int identifier) = 0;
 
   // Informs the delegate that the Autofill previewed form should be cleared.
   virtual void ClearPreviewedForm() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_POPUP_DELEGATE_H_