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

components/autofill/core/browser/autofill_driver.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_DRIVER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DRIVER_H_
 
 #include <vector>
 
 #include "components/autofill/core/common/form_data.h"
@@ skipping 69 matching lines @@
   virtual void RendererShouldClearFilledForm() = 0;
 
   // Tells the renderer to clear the currently previewed Autofill results.
   virtual void RendererShouldClearPreviewedForm() = 0;
 
   // Tells the renderer to set the node text.
   virtual void RendererShouldFillFieldWithValue(
       const base::string16& value) = 0;
 
   // Tells the renderer to preview the node with suggested text.
-  virtual void RendererShouldPreviewFieldWithValue(
-      const base::string16& value) = 0;
+  virtual void RendererShouldPreviewFieldWithValue(const base::string16& value,
+                                                   size_t match_start) = 0;
 
   // Informs the renderer that the popup has been hidden.
   virtual void PopupHidden() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DRIVER_H_