Prepare for date/time input datalist support

public/web/WebDateTimeChooserCompletion.h

 /*
  * Copyright (C) 2012 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "../platform/WebString.h"
 
 namespace WebKit {
 
 // Gets called back when WebViewClient finished choosing a date/time value.
 class WebDateTimeChooserCompletion {
 public:
 
     // Called with a date/time value in the HTML format. The callback instance
     // is destroyed when this method is called.
-    virtual void didChooseValue(const WebString&) = 0;
+    virtual void didChooseValue(double) = 0;

[tkent, 2013/11/07 01:43:10]

You can't do this because it broke Chromium compilation.
You should *add* an overload with double argument.

Please comment what NaN value means.

 
     // Called when a user closed the chooser without choosing a value. The
     // callback instance is destroyed when this method is called.
     virtual void didCancelChooser() = 0;
 
 protected:
     virtual ~WebDateTimeChooserCompletion() { }
 };
 
 } // namespace WebKit
 
 #endif