Add Autofill preview support for <select> input fields

public/web/WebSelectElement.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 38 matching lines @@
 
     WebSelectElement& operator=(const WebSelectElement& element)
     {
         WebFormControlElement::assign(element);
         return *this;
     }
     void assign(const WebSelectElement& element) { WebFormControlElement::assign(element); }
 
     BLINK_EXPORT void setValue(const WebString&);
     BLINK_EXPORT WebString value() const;
+    BLINK_EXPORT void setSuggestedValue(const WebString&);
+    BLINK_EXPORT WebString suggestedValue() const;
+    BLINK_EXPORT void setOriginalValue(const WebString&);
+    BLINK_EXPORT WebString originalValue() const;
     BLINK_EXPORT WebVector<WebElement> listItems() const;
 
 #if BLINK_IMPLEMENTATION
     WebSelectElement(const WTF::PassRefPtr<WebCore::HTMLSelectElement>&);
     WebSelectElement& operator=(const WTF::PassRefPtr<WebCore::HTMLSelectElement>&);
     operator WTF::PassRefPtr<WebCore::HTMLSelectElement>() const;
 #endif
 };
 
 } // namespace blink
 
 #endif