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

chrome/browser/ui/autofill/autofill_popup_controller_impl.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/autofill/autofill_popup_controller_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 472 matching lines @@
     InvalidateRow(selected_line);
 
     if (!CanAccept(suggestions_[selected_line].frontend_id))
       selected_line = kNoSelection;
   }
 
   selected_line_ = selected_line;
 
   if (selected_line_ != kNoSelection) {
     delegate_->DidSelectSuggestion(suggestions_[selected_line_].value,
-                                   suggestions_[selected_line_].frontend_id);
+                                   suggestions_[selected_line_].frontend_id,
+                                   suggestions_[selected_line_].match_start);
   } else {
     delegate_->ClearPreviewedForm();
   }
 }
 
 void AutofillPopupControllerImpl::SelectNextLine() {
   int new_selected_line = selected_line_ + 1;
 
   // Skip over any lines that can't be selected.
   while (static_cast<size_t>(new_selected_line) < GetLineCount() &&
@@ skipping 157 matching lines @@
   popup_bounds_ = gfx::Rect();
 
   suggestions_.clear();
   elided_values_.clear();
   elided_labels_.clear();
 
   selected_line_ = kNoSelection;
 }
 
 }  // namespace autofill