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

components/autofill/content/renderer/password_autofill_agent.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_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 38 matching lines @@
   // Fills the username and password fields of this form with the given values.
   // Returns true if the fields were filled, false otherwise.
   bool FillSuggestion(const blink::WebNode& node,
                       const blink::WebString& username,
                       const blink::WebString& password);
 
   // Previews the username and password fields of this form with the given
   // values. Returns true if the fields were previewed, false otherwise.
   bool PreviewSuggestion(const blink::WebNode& node,
                          const blink::WebString& username,
-                         const blink::WebString& password);
+                         const blink::WebString& password,
+                         int match_start);
 
   // Clears the preview for the username and password fields, restoring both to
   // their previous filled state. Return false if no login information was
   // found for the form.
   bool DidClearAutofillSelection(const blink::WebNode& node);
 
   // Shows an Autofill popup with username suggestions for |element|. If
   // |show_all| is |true|, will show all possible suggestions for that element,
   // otherwise shows suggestions based on current value of |element|.
   // If |generation_popup_showing| is true, this function will return false
@@ skipping 229 matching lines @@
   FormsPredictionsMap form_predictions_;
 
   base::WeakPtrFactory<PasswordAutofillAgent> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordAutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_