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

components/autofill/core/browser/test_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_TEST_AUTOFILL_DRIVER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_TEST_AUTOFILL_DRIVER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 24 matching lines @@
   void PingRenderer() override;
   void PropagateAutofillPredictions(
       const std::vector<autofill::FormStructure*>& forms) override;
   void SendAutofillTypePredictionsToRenderer(
       const std::vector<FormStructure*>& forms) override;
   void RendererShouldAcceptDataListSuggestion(
       const base::string16& value) override;
   void RendererShouldClearFilledForm() override;
   void RendererShouldClearPreviewedForm() override;
   void RendererShouldFillFieldWithValue(const base::string16& value) override;
-  void RendererShouldPreviewFieldWithValue(
-      const base::string16& value) override;
+  void RendererShouldPreviewFieldWithValue(const base::string16& value,
+                                           size_t match_start) override;
   void PopupHidden() override;
 
   // Methods that tests can use to specialize functionality.
 
   // Sets the URL request context for this instance. |url_request_context|
   // should outlive this instance.
   void SetURLRequestContext(net::URLRequestContextGetter* url_request_context);
 
  private:
   scoped_ptr<base::SequencedWorkerPoolOwner> blocking_pool_owner_;
   net::URLRequestContextGetter* url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(TestAutofillDriver);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_TEST_AUTOFILL_DRIVER_H_