Add Autofill preview support for <select> input fields

Source/web/WebSelectElement.cpp

Index: Source/web/WebSelectElement.cpp
diff --git a/Source/web/WebSelectElement.cpp b/Source/web/WebSelectElement.cpp
index 425244b6223151e9e31ba33e6d795486adb89662..074ecb4a34866dbfda02f1e676df9fd0dc26d1fb 100644
--- a/Source/web/WebSelectElement.cpp
+++ b/Source/web/WebSelectElement.cpp
@@ -51,6 +51,16 @@ WebString WebSelectElement::value() const
     return constUnwrap<HTMLSelectElement>()->value();
 }
 
+void WebSelectElement::setSuggestedValue(const WebString& value)
+{
+    unwrap<HTMLSelectElement>()->setSuggestedValue(value);
+}
+
+WebString WebSelectElement::suggestedValue() const
+{
+    return constUnwrap<HTMLSelectElement>()->suggestedValue();
+}
+
 WebVector<WebElement> WebSelectElement::listItems() const
 {
     const Vector<HTMLElement*>& sourceItems = constUnwrap<HTMLSelectElement>()->listItems();