Add Autofill preview support for <select> input fields

Source/core/rendering/RenderListBox.cpp

Index: Source/core/rendering/RenderListBox.cpp
diff --git a/Source/core/rendering/RenderListBox.cpp b/Source/core/rendering/RenderListBox.cpp
index 8918b0a8200027dea27a8e0d1087c181f9235315..7dab3aefec7d40f2bca622b10d3577be1b8fa482 100644
--- a/Source/core/rendering/RenderListBox.cpp
+++ b/Source/core/rendering/RenderListBox.cpp
@@ -426,7 +426,7 @@ void RenderListBox::paintItemForeground(PaintInfo& paintInfo, const LayoutPoint&
     applyTextTransform(style(), itemText, ' ');
 
     Color textColor = element->renderStyle() ? resolveColor(element->renderStyle(), CSSPropertyColor) : resolveColor(CSSPropertyColor);
-    if (isOptionElement && toHTMLOptionElement(*element).selected()) {
+    if (isOptionElement && ((toHTMLOptionElement(*element).selected() && select->suggestedIndex() < 0) || listIndex == select->suggestedIndex())) {
         if (frame()->selection().isFocusedAndActive() && document().focusedElement() == node())
             textColor = RenderTheme::theme().activeListBoxSelectionForegroundColor();
         // Honor the foreground color for disabled items
@@ -460,7 +460,7 @@ void RenderListBox::paintItemBackground(PaintInfo& paintInfo, const LayoutPoint&
     HTMLElement* element = listItems[listIndex];
 
     Color backColor;
-    if (isHTMLOptionElement(*element) && toHTMLOptionElement(*element).selected()) {
+    if (isHTMLOptionElement(*element) && ((toHTMLOptionElement(*element).selected() && selectElement()->suggestedIndex() < 0) || listIndex == selectElement()->suggestedIndex())) {
         if (frame()->selection().isFocusedAndActive() && document().focusedElement() == node())
             backColor = RenderTheme::theme().activeListBoxSelectionBackgroundColor();
         else