Add Autofill preview support for <select> input fields

Source/web/WebFormControlElement.cpp

Index: Source/web/WebFormControlElement.cpp
diff --git a/Source/web/WebFormControlElement.cpp b/Source/web/WebFormControlElement.cpp
index 585260f9128cf504a3271050c653b73089137eba..3968d035eef3a6afa8ac74c540e737edcfacd43a 100644
--- a/Source/web/WebFormControlElement.cpp
+++ b/Source/web/WebFormControlElement.cpp
@@ -119,6 +119,8 @@ void WebFormControlElement::setSuggestedValue(const WebString& value)
         unwrap<HTMLInputElement>()->setSuggestedValue(value);
     if (m_private->hasTagName(HTMLNames::textareaTag))
         unwrap<HTMLTextAreaElement>()->setSuggestedValue(value);
+    if (m_private->hasTagName(HTMLNames::selectTag))

[Inactive, 2014/03/16 23:58:47]

This will also be isHTMLSelectElement(*m_private) once
https://codereview.chromium.org/200723002/ lands (currently in the cq).

[ziran.sun, 2014/03/17 16:41:10]

Done.

+        unwrap<HTMLSelectElement>()->setSuggestedValue(value);
 }
 
 WebString WebFormControlElement::suggestedValue() const
@@ -127,6 +129,8 @@ WebString WebFormControlElement::suggestedValue() const
         return constUnwrap<HTMLInputElement>()->suggestedValue();
     if (m_private->hasTagName(HTMLNames::textareaTag))
         return constUnwrap<HTMLTextAreaElement>()->suggestedValue();
+    if (m_private->hasTagName(HTMLNames::selectTag))

[Inactive, 2014/03/16 23:58:47]

Ditto.

[ziran.sun, 2014/03/17 16:41:10]

Done.

+        return constUnwrap<HTMLSelectElement>()->suggestedValue();
     return WebString();
 }