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

components/autofill/core/browser/test_autofill_driver.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/test_autofill_driver.h"
 
 #include "base/test/sequenced_worker_pool_owner.h"
 #include "base/threading/sequenced_worker_pool.h"
 
 namespace autofill {
@@ skipping 52 matching lines @@
 void TestAutofillDriver::SetURLRequestContext(
     net::URLRequestContextGetter* url_request_context) {
   url_request_context_ = url_request_context;
 }
 
 void TestAutofillDriver::RendererShouldFillFieldWithValue(
     const base::string16& value) {
 }
 
 void TestAutofillDriver::RendererShouldPreviewFieldWithValue(
-    const base::string16& value) {
+    const base::string16& value,
+    size_t match_start) {
 }
 
 void TestAutofillDriver::PopupHidden() {
 }
 
 }  // namespace autofill