Allow binding a getter+setter for window object property.

Source/web/WebFrameImpl.h

Index: Source/web/WebFrameImpl.h
diff --git a/Source/web/WebFrameImpl.h b/Source/web/WebFrameImpl.h
index d67fc22e083711b09cce27956a46d75589b3b711..06ad18a13ac282c30d06442efa76dc82d6641afb 100644
--- a/Source/web/WebFrameImpl.h
+++ b/Source/web/WebFrameImpl.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2013 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -108,6 +109,7 @@ public:
     virtual NPObject* windowObject() const;
     virtual void bindToWindowObject(const WebString& name, NPObject*);
     virtual void bindToWindowObject(const WebString& name, NPObject*, void*);
+    virtual void bindToWindowObject(const WebString& name, WebWindowPropertyCallback*);
     virtual void executeScript(const WebScriptSource&);
     virtual void executeScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sources, unsigned numSources,