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 87 matching lines @@
 
   void OnFormDataFilled(int query_id, const FormData& form);
   void OnFieldTypePredictionsAvailable(
       const std::vector<FormDataPredictions>& forms);
 
   // For external Autofill selection.
   void OnSetAutofillActionFill();
   void OnClearForm();
   void OnSetAutofillActionPreview();
   void OnClearPreviewedForm();
+  void OnPreviewAutoCompleteNode(const base::string16& value);

[Ilya Sherman, 2014/02/22 05:59:51]

nit: Please move this to be right after "OnSetNodeText"

[ziran.sun, 2014/02/27 15:38:11]

Done.

   void OnSetNodeText(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|.
@@ skipping 48 matching lines @@
   // 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);
 
+  // Set preview value for AutoComplete |node|.

[Ilya Sherman, 2014/02/22 05:59:51]

nit: "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."

[ziran.sun, 2014/02/27 15:38:11]

Done.

+  void PreviewAutoCompleteNode(const base::string16& value,
+                               blink::WebInputElement* node);
+
   // Hides any currently showing Autofill UI.
   void HideAutofillUI();
 
   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
   // out of date responses.
@@ skipping 52 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(
       PasswordAutofillAgentTest,
       PasswordAutofillTriggersOnChangeEventsWaitForUsername);
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_