Add Autofill preview support for <select> input fields

Source/core/rendering/RenderMenuList.cpp

Index: Source/core/rendering/RenderMenuList.cpp
diff --git a/Source/core/rendering/RenderMenuList.cpp b/Source/core/rendering/RenderMenuList.cpp
index e64583ce17ad58d11a657ae8ed62be9ec6af7d13..53cbb7696123b01c0e45076aa3cfbf83a5fd7785 100644
--- a/Source/core/rendering/RenderMenuList.cpp
+++ b/Source/core/rendering/RenderMenuList.cpp
@@ -203,10 +203,14 @@ void RenderMenuList::updateFromElement()
         m_optionsChanged = false;
     }
 
-    if (m_popupIsVisible)
+    if (m_popupIsVisible) {
         m_popup->updateFromElement();
-    else
-        setTextFromOption(selectElement()->selectedIndex());
+    } else {
+        if (selectElement()->suggestedIndex() >= 0)
+            setTextFromOption(selectElement()->suggestedIndex());
+        else
+            setTextFromOption(selectElement()->selectedIndex());
+    }
 }
 
 void RenderMenuList::setTextFromOption(int optionIndex)