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

components/autofill/core/browser/autofill_external_delegate.cc

 // 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.
 
 #include "components/autofill/core/browser/autofill_external_delegate.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 168 matching lines @@
       has_suggestion_ && !has_shown_popup_for_current_edit_,
       query_form_,
       query_field_);
   has_shown_popup_for_current_edit_ |= has_suggestion_;
 }
 
 void AutofillExternalDelegate::OnPopupHidden() {
   driver_->PopupHidden();
 }
 
-void AutofillExternalDelegate::DidSelectSuggestion(
-    const base::string16& value,
-    int identifier) {
+void AutofillExternalDelegate::DidSelectSuggestion(const base::string16& value,
+                                                   int identifier,
+                                                   size_t match_start) {
   ClearPreviewedForm();
 
   // Only preview the data if it is a profile.
   if (identifier > 0)
     FillAutofillFormData(identifier, true);
   else if (identifier == POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY)
-    driver_->RendererShouldPreviewFieldWithValue(value);
+    driver_->RendererShouldPreviewFieldWithValue(value, match_start);
 }
 
 void AutofillExternalDelegate::DidAcceptSuggestion(const base::string16& value,
                                                    int identifier,
                                                    int position) {
   if (identifier == POPUP_ITEM_ID_AUTOFILL_OPTIONS) {
     // User selected 'Autofill Options'.
     manager_->ShowAutofillSettings();
   } else if (identifier == POPUP_ITEM_ID_CLEAR_FORM) {
     // User selected 'Clear form'.
@@ skipping 185 matching lines @@
   }
 }
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 void AutofillExternalDelegate::PingRenderer() {
   driver_->PingRenderer();
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 }  // namespace autofill