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

chrome/browser/ui/autofill/autofill_popup_controller_impl.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/autofill/autofill_popup_controller_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 428 matching lines @@
 
   if (selected_line_ != kNoSelection &&
       static_cast<size_t>(selected_line_) < identifiers_.size())
     InvalidateRow(selected_line_);
 
   if (selected_line != kNoSelection)
     InvalidateRow(selected_line);
 
   selected_line_ = selected_line;
 
-  if (selected_line_ != kNoSelection)
-    delegate_->DidSelectSuggestion(identifiers_[selected_line_]);
-  else
+  if (selected_line_ != kNoSelection) {
+    if ((identifiers_[selected_line_] ==
+         WebAutofillClient::MenuItemIDAutocompleteEntry) &&
+        (selected_line_ < static_cast<int>(names_.size())))
+      delegate_->DidSelectAutocompleteSuggestion(names_[selected_line_]);
+    else
+      delegate_->DidSelectSuggestion(identifiers_[selected_line_]);
+  } else {
     delegate_->ClearPreviewedForm();
+    delegate_->ClearAutocompletePreviewedField();
+  }
 }
 
 void AutofillPopupControllerImpl::SelectNextLine() {
   int new_selected_line = selected_line_ + 1;
 
   // Skip over any lines that can't be selected.
   while (static_cast<size_t>(new_selected_line) < names_.size() &&
          !CanAccept(identifiers()[new_selected_line])) {
     ++new_selected_line;
   }
@@ skipping 50 matching lines @@
   names_.erase(names_.begin() + selected_line_);
   full_names_.erase(full_names_.begin() + selected_line_);
   subtexts_.erase(subtexts_.begin() + selected_line_);
   icons_.erase(icons_.begin() + selected_line_);
   identifiers_.erase(identifiers_.begin() + selected_line_);
 
   SetSelectedLine(kNoSelection);
 
   if (HasSuggestions()) {
     delegate_->ClearPreviewedForm();
+    delegate_->ClearAutocompletePreviewedField();
     UpdateBoundsAndRedrawPopup();
   } else {
     Hide();
   }
 
   return true;
 }
 
 int AutofillPopupControllerImpl::LineFromY(int y) {
   int current_height = kPopupBorderThickness;
@@ skipping 122 matching lines @@
   names_.clear();
   subtexts_.clear();
   icons_.clear();
   identifiers_.clear();
   full_names_.clear();
 
   selected_line_ = kNoSelection;
 }
 
 }  // namespace autofill