Add "previewing on hover" support for single-field autocomplete input

components/autofill/core/browser/autofill_popup_delegate.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_AUTOFILL_POPUP_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_POPUP_DELEGATE_H_
 
 #include "base/strings/string16.h"
 
 namespace ui {
@@ skipping 13 matching lines @@
   virtual void OnPopupHidden() = 0;
 
   // Called when the Autofill popup recieves a click outside of the popup view
   // to determine if the event should be reposted to the native window manager.
   virtual bool ShouldRepostEvent(const ui::MouseEvent& event) = 0;
 
   // Called when the autofill suggestion indicated by |identifier| has been
   // temporarily selected (e.g., hovered).
   virtual void DidSelectSuggestion(int identifier) = 0;
 
+  // Called when the Autocomplete suggestion has been temporarily selected
+  // (e.g., hovered).
+  virtual void DidSelectAutocompleteSuggestion(const base::string16& value) = 0;
+
   // Inform the delegate that a row in the popup has been chosen.
   virtual void DidAcceptSuggestion(const base::string16& value,
                                    int identifier) = 0;
 
   // Delete the described suggestion.
   virtual void RemoveSuggestion(const base::string16& value,
                                 int identifier) = 0;
 
   // Informs the delegate that the Autofill previewed form should be cleared.
   virtual void ClearPreviewedForm() = 0;
+
+  // Informs the delegate that the Autocomplete previewed field should be
+  // cleared.
+  virtual void ClearAutocompletePreviewedField() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_POPUP_DELEGATE_H_