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

components/autofill/core/browser/autofill_external_delegate.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/autofill_external_delegate.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autocomplete_history_manager.h"
 #include "components/autofill/core/browser/autofill_driver.h"
 #include "components/autofill/core/browser/autofill_manager.h"
 #include "grit/component_strings.h"
 #include "third_party/WebKit/public/web/WebAutofillClient.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using blink::WebAutofillClient;
+using base::ASCIIToUTF16;
 
 namespace autofill {
 
 AutofillExternalDelegate::AutofillExternalDelegate(
     AutofillManager* autofill_manager,
     AutofillDriver* autofill_driver)
     : autofill_manager_(autofill_manager),
       autofill_driver_(autofill_driver),
       password_autofill_manager_(autofill_driver),
       autofill_query_id_(0),
@@ skipping 139 matching lines @@
 }
 
 void AutofillExternalDelegate::DidSelectSuggestion(int identifier) {
   ClearPreviewedForm();
 
   // Only preview the data if it is a profile.
   if (identifier > 0)
     FillAutofillFormData(identifier, true);
 }
 
+void AutofillExternalDelegate::DidSelectAutocompleteSuggestion(
+    const base::string16& value) {
+  ClearPreviewedForm();
+  ClearAutocompletePreviewedField();
+
+  // Preview the data if it is in an AutoComplete field.
+  autofill_driver_->RendererShouldSetNodeText(value);
+}
+
 void AutofillExternalDelegate::DidAcceptSuggestion(const base::string16& value,
                                                    int identifier) {
   if (identifier == WebAutofillClient::MenuItemIDAutofillOptions) {
     // User selected 'Autofill Options'.
     autofill_manager_->ShowAutofillSettings();
   } else if (identifier == WebAutofillClient::MenuItemIDClearForm) {
     // User selected 'Clear form'.
     autofill_driver_->RendererShouldClearFilledForm();
   } else if (identifier == WebAutofillClient::MenuItemIDPasswordEntry) {
     bool success = password_autofill_manager_.DidAcceptAutofillSuggestion(
@@ skipping 24 matching lines @@
 void AutofillExternalDelegate::DidEndTextFieldEditing() {
   autofill_manager_->delegate()->HideAutofillPopup();
 
   has_shown_autofill_popup_for_current_edit_ = false;
 }
 
 void AutofillExternalDelegate::ClearPreviewedForm() {
   autofill_driver_->RendererShouldClearPreviewedForm();
 }
 
+void AutofillExternalDelegate::ClearAutocompletePreviewedField() {
+  autofill_driver_->RendererShouldSetNodeText(ASCIIToUTF16(""));
+}
+
 void AutofillExternalDelegate::Reset() {
   autofill_manager_->delegate()->HideAutofillPopup();
 
   password_autofill_manager_.Reset();
 }
 
 void AutofillExternalDelegate::AddPasswordFormMapping(
       const FormFieldData& username_field,
       const PasswordFormFillData& fill_data) {
   password_autofill_manager_.AddPasswordFormMapping(username_field, fill_data);
@@ skipping 120 matching lines @@
   // Set the values that all datalist elements share.
   autofill_icons->insert(autofill_icons->begin(),
                          data_list_values_.size(),
                          base::string16());
   autofill_unique_ids->insert(autofill_unique_ids->begin(),
                               data_list_values_.size(),
                               WebAutofillClient::MenuItemIDDataListEntry);
 }
 
 }  // namespace autofill