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

components/autofill/content/renderer/autofill_agent.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_CONTENT_RENDERER_AUTOFILL_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 79 matching lines @@
   virtual void openTextDataListChooser(const blink::WebInputElement& element);
 
   void OnFieldTypePredictionsAvailable(
       const std::vector<FormDataPredictions>& forms);
   void OnFillForm(int query_id, const FormData& form);
   void OnPreviewForm(int query_id, const FormData& form);
 
   // For external Autofill selection.
   void OnClearForm();
   void OnClearPreviewedForm();
-  void OnSetNodeText(const base::string16& value);
+  void OnFillFieldWithValue(const base::string16& value);
+  void OnPreviewFieldWithValue(const base::string16& value);
   void OnAcceptDataListSuggestion(const base::string16& value);
   void OnAcceptPasswordAutofillSuggestion(const base::string16& username);
 
   // Called when interactive autocomplete finishes.
   void OnRequestAutocompleteResult(
       blink::WebFormElement::AutocompleteResult result,
       const FormData& form_data);
 
   // Called when an autocomplete request succeeds or fails with the |result|.
   void FinishAutocompleteRequest(
@@ skipping 33 matching lines @@
   void AcceptDataListSuggestion(const base::string16& suggested_value);
 
   // Fills |form| and |field| with the FormData and FormField corresponding to
   // |node|. Returns true if the data was found; and false otherwise.
   bool FindFormAndFieldForNode(
       const blink::WebNode& node,
       FormData* form,
       FormFieldData* field) WARN_UNUSED_RESULT;
 
   // Set |node| to display the given |value|.
-  void SetNodeText(const base::string16& value, blink::WebInputElement* node);
+  void FillFieldWithValue(const base::string16& value,
+                          blink::WebInputElement* node);
+
+  // Set |node| to display the given |value| as a preview.  The preview is
+  // visible on screen to the user, but not visible to the page via the DOM or
+  // JavaScript.
+  void PreviewFieldWithValue(const base::string16& value,
+                             blink::WebInputElement* node);
 
   // Hides any currently showing Autofill popup.
   void HidePopup();
 
   FormCache form_cache_;
 
   PasswordAutofillAgent* password_autofill_agent_;  // Weak reference.
   PasswordGenerationAgent* password_generation_agent_;  // Weak reference.
 
   // The ID of the last request sent for form field Autofill.  Used to ignore
@@ skipping 54 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(
       PasswordAutofillAgentTest,
       PasswordAutofillTriggersOnChangeEventsWaitForUsername);
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_