Implement <select> Popup Menu using PagePopup

Source/core/page/PagePopupClient.h

Index: Source/core/page/PagePopupClient.h
diff --git a/Source/core/page/PagePopupClient.h b/Source/core/page/PagePopupClient.h
index e67ec48da54441c8a473e3e173811aa436d4e81e..3d9597fe9fa58abf27257c1ffe0adcd924edcb83 100644
--- a/Source/core/page/PagePopupClient.h
+++ b/Source/core/page/PagePopupClient.h
@@ -38,6 +38,7 @@
 
 namespace blink {
 
+class Document;
 class Element;
 class Locale;
 
@@ -52,9 +53,12 @@ public:
     //  - window.setValueAndClosePopup(number, string).
     virtual void writeDocument(SharedBuffer*) = 0;
 
+    // This is called after the document is ready to do additionary setup.
+    virtual void didWriteDocument(Document*) = 0;
+
     virtual Element& ownerElement() = 0;
     // Returns a Locale object associated to the client.
-    virtual Locale& locale() = 0;
+    virtual Locale& locale();
 
     // This is called by the content HTML of a PagePopup.
     // An implementation of this function should call ChromeClient::closePagePopup().